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Graph/repeated-runtime-instantiation

Pattern

Repeated Runtime Instantiation

repeated-runtime-instantiation

Selector functions and helper objects get re-created on each call, and UI configuration is mutated repeatedly; this causes unnecessary allocations, harder-to-reason state, and performance regressions when used widely across the app.

Node Details

Public graph metadata

Updated7/7/2026

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30 linked nodes

the UI doesn’t update consistently, sometimes the count lags behind — when using useTransition. Tension: especially after fast re-renders or route changes. Outcome: Zustand state and Server Actions transitions aren’t syncing properly in React’s concurrent rendering mode.

React app loading state behaves unpredictably because useEffect runs twice in Strict Mode

in every component I have to call this hook with my specific style `const styles = useStyles();` — A performant React Native theme manager/changer. Tension: I'd like to avoid that (or hide this) and simply only have to import them before using them. Outcome: Currently, I have this implementation.

The component throws `Rendered more hooks than during the previous render` when loading the page and after fetching additional users.

Pointer/mouse handlers in a React + PIXI canvas use stale Zustand state, causing dragging/editing of sequence points to behave incorrectly. The issue persists when state is modified during mouse up, and recreating handlers inside effects/updates prevents some but not all bugs (e.g., cannot drag twice).

When multiple React components use Zustand selectors like `useStore(state => state.largeDataset)`, does each component end up copying the large dataset into its own memory, increasing total RAM usage?

After migrating to React 18, dynamically importing a language-specific component with React.lazy based on a zustand state variable causes the component to infinitely render/loading.

Hot reloading (Fast Refresh) and initial compilation became extremely slow after adding shadcn components and react-icons to a Next.js 14 + Tailwind project.

I'm so discouraged by how many lines of code I have to add everywhere. — According to the Sentry docs, I have to add all these lines every time I want to measure something. Tension: It would be so much duplicate code. Outcome: Is all that stuff really supposed to go in all my different Controller methods.

trying to perform data processing during the application's startup. Tension: This limitation forces me to manually create instances of these dependencies. Outcome: this approach doesn't work as expected.

In an Angular 19.2.15 app, each PrimeNG Timeline event renders its associated p-card twice (duplicate card instances appear). The duplication persists on initial load and does not reliably disappear until a change triggers recompilation.

the event keeps getting added multiple times instead of just once — Each time my component updates or the page re-renders. Tension: making my app slower. Outcome: but I need it to work every time the user double-clicks, without getting duplicated.

When the FileSelector component is rendered three times in the same form, selecting a file in instances 2 or 3 updates only the image shown in instance 1.

I need to make sure it's only initialized once — my configuration object that's used everywhere inside the app. Tension: its contents as well as how it is initialized depend on a bunch of things that change depending on the deployment environment.

Repeated authentication logic (updating Redux state, authorizing, and saving tokens) is duplicated across multiple createAsyncThunk services.

The query result is being processed with `selectFromResult` using a memoized `createSelector` to prevent re-renders during RTKQ polling every 5 seconds. The question is whether this selector approach is correct and properly prevents unnecessary component updates.

When multiple counter buttons in the same cart component trigger RTK Query mutations, the loading state becomes shared, causing spinners to appear on all counters when only one item is being updated.

Clarify whether Reselect selector memoization should recompute when an input selector returns an object (e.g., `state.a`) for `selectA1`. The question is whether `a => a.first` runs every time due to `===` checks on objects.

These functions are get re-created, causing memoized children to re-render unnecessarily. — I have a dashboard with many components, and i try to pass functions as props to deeply nested children. Tension: Every time a parent re-renders, these functions are get re-created.

A `dblclick` event listener is attached to each `.ag-header-cell-resize` element multiple times whenever the component re-renders, causing performance degradation.

The notification component is rendered in every component that needs to show notifications, causing inefficient repeated mounting/rendering.

A React effect that uses setInterval with setSeconds causes the effect to rerun every time seconds changes, potentially creating an update loop/infinite interval. The user also wants to access the current seconds value within the interval logic.

In a React Native screen with multiple button images, images finish loading at different times, causing the UI to render before all images are fully loaded.

After deploying a React app to Google Apps Script as a web app, the layout continuously resizes and the scrollbars flicker across pages. This happens even with mock or live data.

Resetting the timer by lifting/resetting state in the parent causes the app/game to become unresponsive due to frequent re-renders. The Timer component also attempts to reset its local state during render, leading to problematic behavior.

In a React app, resizing the browser window causes a parent component to re-render and the child component(s) (e.g., <PaymentOption {...paymentProps} />) to re-render as well, even though the child’s content should not change with layout changes.

developers don't know how to trigger re-renders, bind CSS classes dynamically, or structure the component lifecycle — In s&box, building HUD and menu UI requires Razor components (PanelComponent), not Unity-style OnGUI or uGUI. Tension: BuildHash() is the key re-render trigger that many miss.

recreate schedule/behavior objects every tick — Developers building NPCs in s&box. Tension: causing allocations. Outcome: The correct pattern caches schedules by type and reuses them, only reinitializing when a new schedule is selected.

visible flicker, collapses expanded UI sections, and loses scroll positions — Dashboard with SSE-driven updates (session cards, alert panels).

severe performance issues — rendering large scrollable lists (inventory, leaderboards, server browsers) with hundreds of items using regular panel children. Tension: all panels are created and rendered even when off-screen.

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