He selects a Probe. He taps the build hotkey (B, then E – Pylon). He does it 50 times in 10 seconds. The animation is crisp. No sticky keys. No missed frames.
Navigate to your install directory (typically C:\Program Files (x86)\StarCraft II\Support64 ). starcraft 2 preparing game data extra quality
Why is SC2 downloading "Extra Quality" game data? 📦 He selects a Probe