[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"contentNavigation":3,"topic-reactivity":4,"newsletter-stats":9,"articles-feed-\u002Ftopics\u002Freactivity-1-reactivity-":11,"$fQa3xUpnRDPNiFFu2QS4K-DAjYmsapeR9fNhPNBdpkOc":-1,"home-tags":109},[],{"articleCount":5,"color":6,"id":7,"name":8,"slug":8},4,"#10b981","019daac3-2f85-7393-b891-9da3891267ca","reactivity",{"confirmedCount":10},409,{"items":12,"page":107,"pageSize":108,"totalCount":5},[13,44,68,89],{"content":14,"createdAt":15,"id":16,"image":17,"isAffiliate":18,"isPublished":19,"publishedAt":20,"slug":21,"sourceId":22,"sourceName":23,"sourceType":24,"summary":25,"title":26,"updatedAt":27,"url":28,"urlHash":29,"tags":30},"Performance has become one of the most important aspects of modern frontend development. Users expect websites to be fast and Google rewards fast websites. And yet... even experienced Vue developers still introduce performance issues that can significantly impact user experience. The tricky part? Most applications work perfectly fine during development. Problems usually appear later: larger datasets slower devices poor network conditions increased application complexity In this article, we'll look at 10 common Vue performance mistakes I still see in production applications and how to fix them. Let's dive in. 🤔 Why Vue Performance Matters Vue is already a highly optimized framework. However, even the best framework cannot compensate for inefficient application code. Poor performance can lead to: slow page loads delayed interactions poor Core Web Vitals scores increased battery usage frustrated users The good news? Most performance issues can be fixed with relatively small changes. 🟢 Mistake #1: Using Deep Watchers Everywhere A common mistake is enabling deep watchers on large objects. Example: watch( userData, () => { saveDraft() }, { deep: true } ) Deep watchers force Vue to traverse the entire object tree. For large datasets this can become very expensive. Instead: watch specific properties split large objects use computed values when possible 🟢 Mistake #2: Making Everything Reactive Not every piece of data needs reactivity. I often see code like this: const hugeDataset = ref(largeArray) When the data rarely changes, Vue still needs to create reactive proxies. For large collections this introduces unnecessary overhead. A better approach: const hugeDataset = shallowRef(largeArray) Or even: const hugeDataset = markRaw(largeArray) when reactivity isn't needed at all. 🟢 Mistake #3: Creating New Objects Inside Computed Properties Consider this: const userInfo = computed(() => ({ name: user.value.name, role: user.value.role })) A brand-new object is created every time the computed runs. This can trigger unnecessary component updates. Instead, prefer returning primitives when possible or memoizing expensive transformations. 🟢 Mistake #4: Using v-if Instead of v-show for Frequently Toggled Elements Many developers use: <div v-if=\"isOpen\"> Content <\u002Fdiv> But if the element is shown and hidden frequently, Vue must repeatedly: mount render destroy A better option: <div v-show=\"isOpen\"> Content <\u002Fdiv> This simply toggles CSS visibility. For frequently toggled UI elements, it's usually much faster. 🟢 Mistake #5: Rendering Huge Lists Without Virtualization Rendering thousands of DOM nodes is expensive. Example: <div v-for=\"user in users\" :key=\"user.id\" > {{ user.name }} <\u002Fdiv> This might work with 100 items. It won't feel great with 10,000. Instead consider: virtual scrolling pagination infinite loading Libraries like Vue Virtual Scroller can dramatically improve performance. 🟢 Mistake #6: Lazy Loading Nothing Many applications ship their entire codebase on the first page load. Example: import UserSettings from '.\u002FUserSettings.vue' This increases: bundle size download time parse time Instead: const UserSettings = defineAsyncComponent( () => import('.\u002FUserSettings.vue') ) Users only download code when it's actually needed. 🟢 Mistake #7: Fetching Data Sequentially A surprisingly common issue: const users = await fetchUsers() const posts = await fetchPosts() const comments = await fetchComments() Each request waits for the previous one. A faster approach: const [users, posts, comments] = await Promise.all([ fetchUsers(), fetchPosts(), fetchComments() ]) This can reduce loading times significantly. 🟢 Mistake #8: Forgetting About Image Optimization Images are often the largest assets on a page. Yet many applications still serve: oversized images uncompressed formats images outside the viewport For Vue and Nuxt applications: use WebP or AVIF lazy load images generate responsive sizes Image optimization frequently provides the biggest performance wins. 🟢 Mistake #9: Ignoring Component Re-Renders A component may render far more often than expected. For example: <ExpensiveChart :data=\"chartData\" \u002F> If chartData changes reference on every update, the chart keeps re-rendering. Common solutions: stabilize references use shallowRef avoid unnecessary reactive updates profile components with Vue DevTools Small changes here can have a huge impact. 🟢 Mistake #10: Never Measuring Performance The biggest mistake? Not measuring anything. Many teams optimize blindly. Instead, regularly check: Lighthouse Core Web Vitals Vue DevTools Chrome Performance Panel Network waterfalls Performance work should be data-driven. You can't improve what you don't measure. 🟢 Performance Checklist Before shipping a Vue application, ask yourself: ✅ Am I using deep watchers only when necessary? ✅ Do all objects really need reactivity? ✅ Are large lists virtualized? ✅ Are routes and components lazy loaded? ✅ Are API requests running in parallel? ✅ Are images optimized? ✅ Have I measured actual performance? If any answer is \"no\", there may be easy performance wins available. 🧪 Best Practices Use shallowRef for large datasets Avoid deep watchers whenever possible Lazy load routes and heavy components Virtualize large lists Optimize images aggressively Profile real-world user flows Monitor Core Web Vitals Measure before and after every optimization 📖 Learn more If you would like to learn more about Vue, Nuxt, JavaScript or other useful technologies, checkout VueSchool by clicking this link or by clicking the image below: It covers most important concepts while building modern Vue or Nuxt applications that can help you in your daily work or side projects 😉 🧪 Advance skills A certification boosts your skills, builds credibility, and opens doors to new opportunities. Whether you're advancing your career or switching paths, it's a smart step toward success. Check out Certificates.dev by clicking this link or by clicking the image below: Invest in yourself—get certified in Vue.js, JavaScript, Nuxt, Angular, React, and more! ✅ Summary Vue is fast by default. But performance problems often come from how we use the framework rather than the framework itself. In this article, you learned: 10 common Vue performance mistakes Why they impact real-world applications How to identify them Practical ways to fix them Best practices for building faster Vue apps Many of these issues are easy to overlook during development but become expensive at scale. By avoiding these mistakes and measuring performance regularly, you can build applications that feel fast, responsive, and enjoyable to use. Take care! And happy coding as always 🖥️","2026-06-15T08:00:09.697Z","019eca4b-8dce-754e-ad17-a0f9b1aef338","https:\u002F\u002Fmedia2.dev.to\u002Fdynamic\u002Fimage\u002Fwidth=1200,height=627,fit=cover,gravity=auto,format=auto\u002Fhttps%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fidhps7seqfikj9j24oz3.png",false,true,"2026-06-15T07:08:48.000Z","10-vue-performance-mistakes-i-still-see-in-production-apps","019d6bd6-7fe0-7244-80dc-9a4e8751886a","Jakub Andrzejewski","rss","This article discusses ten common performance mistakes that Vue developers often make in production applications, highlighting issues such as using deep watchers unnecessarily and making everything reactive. It emphasizes the importance of optimizing performance to enhance user experience and offers practical solutions to improve application efficiency.","10 Vue Performance Mistakes I Still See in Production Apps","2026-06-15T08:00:29.794Z","https:\u002F\u002Fdev.to\u002Fjacobandrewsky\u002F10-vue-performance-mistakes-i-still-see-in-production-apps-52a1","4bad7a0b92210da78523e2dbba139490f2eade4aa9b344635bb1bb7b69b6959a",[31,34,37,40,41],{"color":6,"id":32,"name":33,"slug":33},"019d6bd8-c9a8-7783-bd22-03145b355427","vue",{"color":6,"id":35,"name":36,"slug":36},"019d6bd8-ca26-775c-b9b5-c3439dbe5789","performance",{"color":6,"id":38,"name":39,"slug":39},"019e3af5-4a35-705c-8ab1-4404b653e0e8","optimization",{"color":6,"id":7,"name":8,"slug":8},{"color":6,"id":42,"name":43,"slug":43},"019d6bd9-010e-772d-b2f0-9378a042a676","best-practices",{"content":45,"createdAt":46,"id":47,"image":48,"isAffiliate":18,"isPublished":19,"publishedAt":49,"slug":50,"sourceId":22,"sourceName":23,"sourceType":24,"summary":51,"title":52,"updatedAt":53,"url":54,"urlHash":55,"tags":56},"Animations can make an application feel faster, smoother, and more polished. However, many developers think animations are only useful for things like: page transitions modals enter\u002Fleave effects But Vue provides another powerful pattern - State-driven animations. Instead of animating when elements are added or removed from the DOM, you animate changes in reactive state. This allows you to create rich interactive experiences while keeping your code declarative and easy to maintain. In this article, we'll explore: What state-driven animations are How they differ from regular Vue transitions What problems they solve How to implement them in Vue Best practices for creating smooth UI interactions Let's dive in. 🤔 What Are State-Driven Animations? Most Vue developers are familiar with the <Transition> component. Example: <Transition> <Modal v-if=\"isOpen\" \u002F> <\u002FTransition> This animates an element when it enters or leaves the DOM. But what if the element already exists and only its state changes? For example: a progress bar grows a card expands a chart updates a panel changes size a value changes position This is where state-driven animations shine. Instead of animating DOM insertion or removal, you animate changes caused by reactive state. 🟢 What Problem Do State-Driven Animations Solve? Without animations, state changes can feel abrupt. Example: <div :style=\"{ width: progress + '%' }\"><\u002Fdiv> When progress changes: progress.value = 80 The width instantly jumps. This works technically... but it doesn't feel great. 🟢 A Simple Example Let's create an animated progress bar. <script setup lang=\"ts\"> const progress = ref(20) function increase() { progress.value += 20 } <\u002Fscript> <template> <button @click=\"increase\"> Increase Progress <\u002Fbutton> <div class=\"progress-container\"> <div class=\"progress-bar\" :style=\"{ width: `${progress}%` }\" \u002F> <\u002Fdiv> <\u002Ftemplate> CSS: .progress-container { width: 100%; height: 12px; background: #eee; } .progress-bar { height: 100%; background: #42b883; transition: width 0.3s ease; } Now whenever progress changes, the bar animates smoothly. The animation is entirely driven by reactive state. 🟢 Animating Multiple Properties State-driven animations are not limited to width. Example: <div class=\"card\" :style=\"{ transform: expanded ? 'scale(1.1)' : 'scale(1)', opacity: expanded ? 1 : 0.7 }\" \u002F> CSS: .card { transition: transform 0.3s ease, opacity 0.3s ease; } Now changing: expanded.value = true animates scale and opacity at the same time. 🟢 Using Vue Reactivity with Animations One of the biggest advantages is that animations stay connected to Vue's reactivity system. Example: <script setup lang=\"ts\"> const isActive = ref(false) <\u002Fscript> <template> <button @click=\"isActive = !isActive\"> Toggle <\u002Fbutton> <div class=\"box\" :class=\"{ active: isActive }\" \u002F> <\u002Ftemplate> CSS: .box { width: 100px; height: 100px; transition: all 0.4s ease; } .box.active { transform: rotate(180deg); } Vue handles state. CSS handles animation. The result is clean and maintainable. 🧪 Best Practices Keep animations subtle and purposeful Prefer CSS transitions for simple effects Avoid animating expensive properties when possible Use transforms instead of layout-changing properties when appropriate Don't animate everything Keep durations short (typically 200–400ms) Use animations to communicate state changes, not distract users 📖 Learn more If you would like to learn more about Vue, Nuxt, JavaScript or other useful technologies, checkout VueSchool by clicking this link or by clicking the image below: It covers most important concepts while building modern Vue or Nuxt applications that can help you in your daily work or side projects 😉 🧪 Advance skills A certification boosts your skills, builds credibility, and opens doors to new opportunities. Whether you're advancing your career or switching paths, it's a smart step toward success. Check out Certificates.dev by clicking this link or by clicking the image below: Invest in yourself—get certified in Vue.js, JavaScript, Nuxt, Angular, React, and more! ✅ Summary State-driven animations are a powerful way to create smooth and engaging user experiences in Vue. While <Transition> is perfect for entering and leaving elements, state-driven animations excel when existing elements need to react smoothly to changing data. Used thoughtfully, they can make your applications feel significantly more responsive and professional. Take care! And happy coding as always 🖥️","2026-06-01T12:00:05.566Z","019e830e-2fa7-74ed-8c74-71fc2c69cb52","https:\u002F\u002Fmedia2.dev.to\u002Fdynamic\u002Fimage\u002Fwidth=1200,height=627,fit=cover,gravity=auto,format=auto\u002Fhttps%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fvih3y2fdc8upo7ni9m42.png","2026-06-01T09:54:37.000Z","state-driven-animations-in-vue-create-smooth-ui-transitions-with-reactive-state","This article explores state-driven animations in Vue, highlighting how they enhance UI transitions by animating changes in reactive state rather than just DOM insertion or removal. It provides examples and best practices for implementing these animations to create smoother, more interactive user experiences.","State-Driven Animations in Vue: Create Smooth UI Transitions with Reactive State","2026-06-10T14:35:13.767Z","https:\u002F\u002Fdev.to\u002Fjacobandrewsky\u002Fstate-driven-animations-in-vue-create-smooth-ui-transitions-with-reactive-state-d3i","b6046ff3585c584d9e28b56411b296d962249089895ddbb6902902fabcfdafec",[57,58,61,62,65],{"color":6,"id":32,"name":33,"slug":33},{"color":6,"id":59,"name":60,"slug":60},"019e830e-5378-722b-929b-a57d67bcf605","animation",{"color":6,"id":7,"name":8,"slug":8},{"color":6,"id":63,"name":64,"slug":64},"019d6bd8-ca8b-709c-b9a5-77d4910da162","ui-components",{"color":6,"id":66,"name":67,"slug":67},"019d6bd8-fba5-743f-8f9f-4e23c0b31581","tutorial",{"content":69,"createdAt":70,"id":71,"image":72,"isAffiliate":18,"isPublished":19,"publishedAt":73,"slug":74,"sourceId":75,"sourceName":76,"sourceType":77,"summary":78,"title":79,"updatedAt":80,"url":81,"urlHash":82,"tags":83},null,"2026-04-30T12:00:02.889Z","019dde42-a535-7402-94ba-a1dfc1f9ac89","https:\u002F\u002Fi.ytimg.com\u002Fvi\u002FMMQl0HiNV8w\u002Fhqdefault.jpg","2026-04-30T10:00:06.000Z","reza-bar---reactivity-in-vue-thinking-in-signals","019d9ce0-e8f2-774a-ba57-a61c19469fe1","Vuejs Amsterdam","youtube","The article discusses the concept of reactivity in Vue.js, focusing on the use of signals as a way to manage state and reactivity in applications. It explores how signals can enhance the reactivity model in Vue, providing a new perspective on state management.","Reza Bar - Reactivity in Vue Thinking in Signals","2026-04-30T12:00:11.580Z","https:\u002F\u002Fwww.youtube.com\u002Fwatch?v=MMQl0HiNV8w","14abc936dca2f0684fdef3675153a32f57853fa196ea1fa4363eeedb905571eb",[84,85,86],{"color":6,"id":32,"name":33,"slug":33},{"color":6,"id":7,"name":8,"slug":8},{"color":6,"id":87,"name":88,"slug":88},"019da076-78fb-706b-9a4c-cee0c989cfff","state-management",{"content":90,"createdAt":91,"id":92,"image":93,"isAffiliate":18,"isPublished":19,"publishedAt":94,"slug":95,"sourceId":75,"sourceName":76,"sourceType":77,"summary":96,"title":97,"updatedAt":98,"url":99,"urlHash":100,"tags":101},"We're going to explore how Vue can power more than user interfaces—by running its reactivity system on the backend. No installs ...","2026-04-20T12:00:01.595Z","019daac3-0825-7156-a2a8-afa51eb8b7aa","https:\u002F\u002Fi.ytimg.com\u002Fvi\u002FhFgqGgaHo0U\u002Fhqdefault.jpg","2026-04-20T10:00:06.000Z","marc-backes---the-backend-is-reactive-vue-beyond-the-browser","This article discusses the potential of using Vue's reactivity system on the backend, highlighting its capabilities beyond just user interfaces. 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