Use a high‑fps capture card—144 or 240 fps is non‑negotiable if you want every micro‑event. Hook a second monitor to your rig and run the replay or in‑game timer there, so you can keep an eye on splits without juggling the primary window. The key is a stable frame‑rate: lock the game to 60 fps or the target, then record at double that so you can scrub backward in 0.1 s steps. Sync the capture software with the game’s timestamp; use a script that logs every key press or trigger you set for splits. Then, in post‑edit, line up the timestamps with the footage and drop any jitter with a gentle motion blur. Remember, you’re not filming a film—just a series of 0.001 s decisions, so keep everything as tight and automated as possible. Good luck, and try not to hit that 10‑second lag you got on your last run.