Your queries are not the issue, those should be handled without a problem.
I can’t say for sure without really digging into this but I would start with optimizing your page. Your thumbnails are like 4-6 MB each. I could optimize these images down to 20K without losing quality.
The initial page load takes 22 seconds and that is in Chrome and Firefox.
The flickering issue I think has to due with the fixed sidebar. There is an onscroll event being fired every time you scroll the page that chrome has a hard time handling but that very well could be due to the massive page size.
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