Performance Regression or Improvement: combine_python_batch_2gb_10_byte_records:runtime

[github-actions]

Performance change found in the
test: combine_python_batch_2gb_10_byte_records for the metric: runtime.

For more information on how to triage the alerts, please look at
Triage performance alert issues section of the README.

Test description: Combine Python Load Test 2 GB 10 byte records
Test link - https://github.com/apache/beam/blob/5e38decf9e723a385057131b01bbd33d8c60bda3/.test-infra/jenkins/job_LoadTests_Combine_Python.groovy#L76C24-L76C65
Test dashboard - http://metrics.beam.apache.org/d/WNzYt13Zk/combine-load-tests?orgId=1&from=now-90d&to=now&var-processingType=batch&var-sdk=python&viewPanel=2

timestamp: Wed Jun 17 16:40:01 2026, metric_value: 246.00
timestamp: Tue Jun 16 17:04:41 2026, metric_value: 242.00
timestamp: Mon Jun 15 17:02:07 2026, metric_value: 221.00 <---- Anomaly
timestamp: Sun Jun 14 16:01:16 2026, metric_value: 313.00
timestamp: Sat Jun 13 16:04:26 2026, metric_value: 308.00
timestamp: Fri Jun 12 16:33:20 2026, metric_value: 330.00
timestamp: Thu Jun 11 16:50:24 2026, metric_value: 325.00
timestamp: Wed Jun 10 16:41:59 2026, metric_value: 282.00
timestamp: Tue Jun  9 16:28:39 2026, metric_value: 353.00
timestamp: Mon Jun  8 16:50:43 2026, metric_value: 287.00
timestamp: Sun Jun  7 15:59:09 2026, metric_value: 255.00
timestamp: Sat Jun  6 15:58:30 2026, metric_value: 333.00
timestamp: Fri Jun  5 16:28:41 2026, metric_value: 339.00