I'm having a similar issue with Big Sur on an iMac (4 GHz Quad-Core Intel Core i7). I have the latest Opera version (72.0.3815.378). If I leave a tab for a second or two (e.g., when I open a new tab), it is blank when I return. If I wait for a while it will usually repopulate, but it can take 15 seconds or longer.
M
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RE: Graphical Glitches & Rendering Issues in Big Sur 11.0.1Opera for Mac