---
title: "CODM: severe lag spike after Alt-Tab — TAC vendor regression"
canonical_url: https://emudesk.com/issues/codm-alt-tab-severe-lag-tac
content_locale: en
source_locale: en
entity_type: issue
index_status: index
published_at: 2026-08-31T18:22:23.000Z
updated_at: 2026-09-01T00:45:02.067Z
freshness_status: fresh
---

# CODM: severe lag spike after Alt-Tab — TAC vendor regression

While playing CODM through TAC, the game runs smoothly — until the user Alt-Tabs out (e.g., to check Discord, change a Spotify track, glance at a browser). When refocusing back to CODM, the framerate drops to single digits and stays there for the rest of the match. Restarting the match doesn't help; only restarting the emulator restores normal FPS.


  "somehow im not lagging anymore but if i tab holy lag" — Dusk
  "The game had that issue since just before old GameLoop got obsolete. Another bug in the books lads" — ӃryptønPsychø (vendor-acknowledged but not fixed)


Root cause: TAC's renderer doesn't properly resume after losing window focus on Windows 10/11 with high-refresh monitors. Frame pacing breaks and the game effectively renders one frame per second of compositor wakeup.