fix(ui) reduce redundant rerenders (#3593)

* Improve rerendering of resource view

* Lint fix

* Remove console log

* Fix panel logic

---------

Co-authored-by: Theodore Li <theo@sim.ai>

Author: TheodoreSpeaks

apps/sim/app/workspace/[workspaceId]/home/components/mothership-view/components/resource-content/resource-content.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { lazy, Suspense, useCallback, useEffect, useMemo } from 'react'
+import { lazy, memo, Suspense, useCallback, useEffect, useMemo } from 'react'
 import { createLogger } from '@sim/logger'
 import { Square } from 'lucide-react'
 import { useRouter } from 'next/navigation'
@@ -51,7 +51,11 @@ interface ResourceContentProps {
  * Handles table, file, and workflow resource types with appropriate
  * embedded rendering for each.
  */
-export function ResourceContent({ workspaceId, resource, previewMode }: ResourceContentProps) {
+export const ResourceContent = memo(function ResourceContent({
+  workspaceId,
+  resource,
+  previewMode,
+}: ResourceContentProps) {
   switch (resource.type) {
     case 'table':
       return <Table key={resource.id} workspaceId={workspaceId} tableId={resource.id} embedded />
@@ -84,7 +88,7 @@ export function ResourceContent({ workspaceId, resource, previewMode }: Resource
     default:
       return null
   }
-}
+})
 
 interface ResourceActionsProps {
   workspaceId: string
@@ -303,10 +307,12 @@ interface EmbeddedWorkflowProps {
 
 function EmbeddedWorkflow({ workspaceId, workflowId }: EmbeddedWorkflowProps) {
   const workflowExists = useWorkflowRegistry((state) => Boolean(state.workflows[workflowId]))
-  const hydrationPhase = useWorkflowRegistry((state) => state.hydration.phase)
-  const hydrationWorkflowId = useWorkflowRegistry((state) => state.hydration.workflowId)
-  const isMetadataLoaded = hydrationPhase !== 'idle' && hydrationPhase !== 'metadata-loading'
-  const hasLoadError = hydrationPhase === 'error' && hydrationWorkflowId === workflowId
+  const isMetadataLoaded = useWorkflowRegistry(
+    (state) => state.hydration.phase !== 'idle' && state.hydration.phase !== 'metadata-loading'
+  )
+  const hasLoadError = useWorkflowRegistry(
+    (state) => state.hydration.phase === 'error' && state.hydration.workflowId === workflowId
+  )
 
   if (!isMetadataLoaded) return LOADING_SKELETON
 

apps/sim/app/workspace/[workspaceId]/home/components/mothership-view/mothership-view.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { useCallback, useEffect, useState } from 'react'
+import { memo, useCallback, useEffect, useState } from 'react'
 import { cn } from '@/lib/core/utils/cn'
 import { getFileExtension } from '@/lib/uploads/utils/file-utils'
 import type { PreviewMode } from '@/app/workspace/[workspaceId]/files/components/file-viewer'
@@ -34,7 +34,7 @@ interface MothershipViewProps {
   className?: string
 }
 
-export function MothershipView({
+export const MothershipView = memo(function MothershipView({
   workspaceId,
   chatId,
   resources,
@@ -99,4 +99,4 @@ export function MothershipView({
       </div>
     </div>
   )
-}
+})

apps/sim/app/workspace/[workspaceId]/home/home.tsx

@@ -167,7 +167,6 @@ export function Home({ chatId }: HomeProps = {}) {
 
   const handleResourceEvent = useCallback(() => {
     if (isResourceCollapsedRef.current) {
-      /** Auto-collapse sidebar to give resource panel maximum width for immersive experience */
       const { isCollapsed, toggleCollapsed } = useSidebarStore.getState()
       if (!isCollapsed) toggleCollapsed()
       setIsResourceCollapsed(false)

apps/sim/app/workspace/[workspaceId]/home/hooks/use-chat.ts

@@ -682,8 +682,7 @@ export function useChat(
                     readArgs?.path as string | undefined,
                     tc.result.output
                   )
-                  if (resource) {
-                    addResource(resource)
+                  if (resource && addResource(resource)) {
                     onResourceEventRef.current?.()
                   }
                 }
@@ -694,12 +693,21 @@ export function useChat(
             case 'resource_added': {
               const resource = parsed.resource
               if (resource?.type && resource?.id) {
-                addResource(resource)
+                const wasAdded = addResource(resource)
                 invalidateResourceQueries(queryClient, workspaceId, resource.type, resource.id)
 
+                if (!wasAdded && activeResourceIdRef.current !== resource.id) {
+                  setActiveResourceId(resource.id)
+                }
                 onResourceEventRef.current?.()
+
                 if (resource.type === 'workflow') {
-                  if (ensureWorkflowInRegistry(resource.id, resource.title, workspaceId)) {
+                  const wasRegistered = ensureWorkflowInRegistry(
+                    resource.id,
+                    resource.title,
+                    workspaceId
+                  )
+                  if (wasAdded && wasRegistered) {
                     useWorkflowRegistry.getState().setActiveWorkflow(resource.id)
                   } else {
                     useWorkflowRegistry.getState().loadWorkflowState(resource.id)