fix: performance

frontend/src/components/nodes/render/useRenderingNodeState.ts

@@ -38,6 +38,8 @@ export type RenderingNodeData = {
 const DEFAULT_VIEWPORT_WIDTH = 1200
 const DEFAULT_VIEWPORT_HEIGHT = 800
 const RENDER_DEBOUNCE_MS = 250
+/** Skip auto-run when we have cache and effect runs soon after mount (node became visible). */
+const VISIBILITY_GRACE_MS = 400
 
 /** Lifecycle state to pass to useSyncConnectionStatus so edge status (updating/error) stays in sync. */
 export type RenderingNodeLifecycle = {
@@ -194,6 +196,8 @@ export function useRenderingNodeState(
     const minLoadingTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null)
     const lastManualRunTriggerRef = useRef(0)
     const manualRunTriggerSyncedRef = useRef(false)
+    /** In auto mode, skip running when we have cache and we're in the grace window after mount (node became visible). */
+    const mountTimeRef = useRef<number>(0)
 
     const updateDataRef = useRef(updateData)
     updateDataRef.current = updateData
@@ -214,6 +218,7 @@ export function useRenderingNodeState(
     useSyncConnectionStatus(id, lifecycle)
 
     useEffect(() => {
+        if (mountTimeRef.current === 0) mountTimeRef.current = Date.now()
         if (incomingIds.length === 0) {
             setRenderedContent(null)
             setResolvedContent(null)
@@ -258,6 +263,18 @@ export function useRenderingNodeState(
             lastManualRunTriggerRef.current = runTrigger
         }
 
+        // Auto mode: do not run when node just became visible (remount with cache). No pipeline run, no path/addTrigger.
+        if (effectiveUpdateMode === 'auto') {
+            const hasCache = Boolean(
+                (data?.cachedRenderedContent ?? data?.cachedResolvedContent) as string | undefined
+            )
+            const signatureUnchanged =
+                data?.lastRunSourceSignature != null && data.lastRunSourceSignature === sourceSignature
+            const withinVisibilityGrace =
+                mountTimeRef.current > 0 && Date.now() - mountTimeRef.current < VISIBILITY_GRACE_MS
+            if (hasCache && (signatureUnchanged || withinVisibilityGrace)) return
+        }
+
         runIdRef.current += 1
         const thisRunId = runIdRef.current
         const signatureForThisRun = sourceSignature