Skip the work for all-zero-CPU samples.

Author: mstange

src/components/shared/thread/ActivityGraphFills.tsx

@@ -311,6 +311,13 @@ export class ActivityGraphFillComputer {
     for (let i = 0; i < samples.length; i++) {
       const halfwayPositionAfter = halfwayPositions[i + 1];
       const afterSampleCpuPercent = threadCPUPercent[i + 1];
+
+      if (beforeSampleCpuPercent === 0 && afterSampleCpuPercent === 0) {
+        halfwayPositionBefore = halfwayPositionAfter;
+        beforeSampleCpuPercent = afterSampleCpuPercent;
+        continue;
+      }
+
       const category = samples.category[i];
 
       const bufferIndex =