WebGPURenderer: Trim compute-path allocations.

- Renderer.compute: cache a singleton array for single-node dispatches instead of allocating [ computeNode ] per call.
- WebGPUTimestampQueryPool._resolveQueries: reuse scratch submit array.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: RenaudRohlinger

src/renderers/common/Renderer.js

@@ -2755,7 +2755,19 @@ class Renderer {
 		const bindings = this._bindings;
 		const nodes = this._nodes;
 
-		const computeList = Array.isArray( computeNodes ) ? computeNodes : [ computeNodes ];
+		let computeList;
+
+		if ( Array.isArray( computeNodes ) ) {
+
+			computeList = computeNodes;
+
+		} else {
+
+			if ( this._computeSingleton === undefined ) this._computeSingleton = [ null ];
+			this._computeSingleton[ 0 ] = computeNodes;
+			computeList = this._computeSingleton;
+
+		}
 
 		if ( computeList[ 0 ] === undefined || computeList[ 0 ].isComputeNode !== true ) {
 

src/renderers/webgpu/utils/WebGPUTimestampQueryPool.js

@@ -1,6 +1,8 @@
 import { error, warnOnce } from '../../../utils.js';
 import TimestampQueryPool from '../../common/TimestampQueryPool.js';
 
+const _submitArray = [ null ];
+
 /**
  * Manages a pool of WebGPU timestamp queries for performance measurement.
  * Extends the base TimestampQueryPool to provide WebGPU-specific implementation.
@@ -154,8 +156,9 @@ class WebGPUTimestampQueryPool extends TimestampQueryPool {
 				bytesUsed
 			);
 
-			const commandBuffer = commandEncoder.finish();
-			this.device.queue.submit( [ commandBuffer ] );
+			_submitArray[ 0 ] = commandEncoder.finish();
+			this.device.queue.submit( _submitArray );
+			_submitArray[ 0 ] = null;
 
 			if ( this.resultBuffer.mapState !== 'unmapped' ) {