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Keeping up with the screen at a high frame rate.
Recording takes real work from your Mac's CPU, GPU and drive. When recordings drop frames or the recorded application slows down, these are the things to adjust.
Close non-essential background programs, record the smallest area you can, and lower the recording quality in Screenflick's preferences. Keep reading.
Turn V-Sync on in the game. Keep reading.
When recording video games, or other programs with high performance OpenGL graphics, make sure the game has V-Sync turned on. With V-Sync off, the frame rate of the game can go above the maximum of the display, and above the recording frame rate chosen in Screenflick. That steals processing power away from Screenflick.
See Recording Fullscreen Games for more, including capture scaling.