Try disabling V-Sync or setting it to Adaptive. Also... Only 8 gigabytes of RAM? These aren't the dark ages!
If you still want the remake tracks and the HD graphics, you can download the 20th Anniversary build.
I actually saw the multiplayer test video. Might I suggest a preliminary system clock synchronization, so that the countdown occurs simultaneously for everyone playing regardless of their latency? Portal 2 does something similar to that in co-op mode.





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