do you have system specs?
We're not really focussed on optimisation at this stage as the gameplay is still being validated, but appreciate you giving it a try either way.
One issue we had with some systems was GameMaker wasn't detecting the GPU and was running something else [so higher spec machines weren't actually using their hardware]. I thought we caught that in one of the recent updates but we'll look into it more over the next few months.
At this stage we're still validating the gameplay concept, so getting the game optimised isn't so much of a priority yet. Thanks for trying though.