Window drags run at 11-28 flips/s for the first ~3 minutes after login #11

Finder window drags right after login run at 11-28 flips/s for about two to three minutes, then settle at 75-77 flips/s. Seen on stock NullMoth 2.3.7 (N-168: 11-26 flips/s from +72 s to +180 s, load 13 falling to 5) and with the fork plugin on 2.3.6 kexts (N-167: 11-28). With the commit-time submit-ahead pass off (N-166) the early runs were 33-39. So part is login load (Spotlight, WindowManager), but the GPU path makes it much worse. Measure: evidence/native/i-069-bisect/timed-drag.sh (waits for the gpu-guard's Good). Next: a WindowServer spindump during a slow early drag. Evidence: project-legion evidence/native/N-167/README.md, evidence/native/N-168/timed-drag-part1.txt. Tracker I-069.