Looking at your computer specs, unfortunately the system requirements for an RPGMAKER game is about 4gb in RAM, with Grove potentially requiring a little bit more due to the presence of large .png images. It also doesn't help that the MV engine isn't the most optimised thing in the world, but we'll try and improve the overall performance of the engine in the future.
Regarding your zip issue:
I have a feeling that the zip issues are caused by your low system specs, with a browser potentially only loading certain scenes, hence the better performance. This is evident when you mentioned you crash in the Desert area as there are a few large assets there, but performance in the area in general isn't all too great for a few with decent rigs. We're looking into that for the next update as well.
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We'll do what we can with improving the performance in the future, but at the moment, it does seem like the primary issue relates to your low system specs. I do apologise I can't be of any better help!
- RegalBuster