Real desktop runtime: Linux, Electron 44.10.1, GPU disabled, Xvfb, light theme.
Fresh synthetic project and replay provider in each checkout. Actual preview: 1600x900.

BASE 96ca66f218c326f805aca74e463907967990880f
Control: 15 evaluates in 10-22 ms; baseline Electron main RSS 238.4 MiB.
Recording start: 6304 ms. First evaluate: 15 ms.
Next four evaluates: 15021, 15022, 15016, 15022 ms, all timed out.
Main RSS: 955.6 MiB at +12 s; 1600.8 MiB at +32 s; 2777.5 MiB at +52 s; 4189.5 MiB at +76 s.
Electron terminated before the remaining evaluates, click, and recording stop.
Electron stderr excerpt:
Mark-Compact (reduce) 3668.7 (3676.7) -> 3668.7 (3676.5) MB
Mark-Compact (reduce) 3668.7 (3676.5) -> 3668.7 (3676.2) MB
OOM error in V8: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
The sampler subsequently failed because exited Electron no longer had VmRSS.

HEAD 4abf7407ac6596100859c9ecc78a6f1683348a45
Control: 15 evaluates in 12-29 ms; baseline Electron main RSS 240.3 MiB.
Recording start: 5474 ms. All 15 recording evaluates completed:
15,115,87,83,116,137,124,37,80,77,57,43,88,64,65 ms.
Click completed in 1365 ms. Evaluate 2+2 returned 4 in 26 ms.
Main RSS peaked at 357.3 MiB, settled around 241 MiB, and was 251.3 MiB after stop.
Desktop stayed running through a 90-second observation.
Recording stop replied in 296 ms: The recording exceeds 50 MiB. Make a shorter recording.
The existing recording-size limit still applies; successful video export is not claimed.