Screen flicker with TMUX on long-running sessions/missions (5+ hours) — Mac Mini M4 / Warp Terminal

[Tigres2526]

Description

Experiencing persistent screen flickering when running Factory sessions/missions that exceed approximately 5 hours. The issue appears to be strongly correlated with TMUX usage and becomes increasingly noticeable the longer a session runs.

Environment

Component	Details
Machine	Mac Mini M4
macOS	Sequoia 15.4 (latest)
Terminal	Warp
Multiplexer	TMUX
Session Duration	5+ hours when issue manifests

Steps to Reproduce

1. Start a Factory session/mission inside a TMUX session using Warp terminal on Mac Mini M4
2. Let the session run continuously for 5+ hours
3. Observe screen flickering that begins intermittently and may worsen over time

Observed Behavior

• Screen flickers during active Factory sessions/missions running inside TMUX
• The flicker is most noticeable (and most reliably reproduced) after ~5 hours of continuous runtime
• The issue occurs most of the time — it is not a rare/edge-case occurrence
• Flickering affects the terminal viewport and can disrupt workflow visibility

Expected Behavior

Factory sessions/missions should run stably inside TMUX for extended periods without any screen flickering or visual artifacts, regardless of session duration.

Potential Contributing Factors

• TMUX redraw/refresh cycles: Long-running sessions may cause accumulated redraw state that conflicts with Warp's GPU-accelerated rendering pipeline
• Warp terminal GPU rendering: Warp uses Metal-based GPU rendering on macOS — prolonged TMUX output streams may trigger buffer or compositing issues on the M4 GPU
• Factory output frequency: High-frequency terminal output from long missions could exacerbate TMUX's screen redraw overhead
• TMUX alternate screen / escape sequence handling: Extended sessions may accumulate escape sequences or alternate screen toggles that cause rendering inconsistencies between TMUX and Warp

Workaround Attempts

• Detaching and reattaching the TMUX session may temporarily alleviate the flicker
• Running outside of TMUX (directly in Warp) does not exhibit the same issue, further isolating TMUX as a contributing factor

Additional Context

This appears to be specific to the combination of:

• Long-running Factory sessions (5+ hrs)
• TMUX as the session multiplexer
• Warp terminal on Apple Silicon (M4)

Would be helpful to know if others on similar setups (M4 + Warp + TMUX) experience the same, or if this is isolated to a specific TMUX/Warp version combination.

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Happy to provide TMUX config, Warp version, or screen recordings if helpful for debugging.