First experience : cannot use the keyboard :o/

Okay

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I've been playing PS2 since 2013 and it runs okay on my PC. Not super smooth, but I get around 40-50fps in heated battles.

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I've just tested PSA and the game freezes for about 20-30 seconds each time I hit a key on my keyboard. Which is not exactly ideal. If I don't press anything, once the freeze ends, I can look around, no problem. For example, in the deploy phase, the ship flies okay, and once I press 'E' to get out, I drop, everything's smooth as long as I don't hit any key on the keyboard. If I press any key, it freezes again.

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I tried reducing Video settings, but to no avail.

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Any ideas ?