-Join a heavily stressed server or make your own (a thousand AI fighiting each other should seal the deal)
-Your frames must be around 20 or 30 (under stress)
*1: Get in a car (for more obvious results);
*2: Get some speed so you can better notice the drop;
1. Press random key (any keyboard key will do) (causes frame drop);
2. Release random key (FPS will come back to stable);
3. Press 2 random keys (bigger drop than the 1st time;
4. Press 3 random keys (nearly frozen screen);
[Always press the keys at the same time, release at the same time]