One more advice: Stocktake custom content your server is running. "More" doesn't mean "better". "I want it all" approach usually leads to various issues. Maybe removing some useless or similar guns (e.g. AK47/Golden AK47/MKB42 - keeping only one of them doesn't affect gameplay at all) and annoying zeds can not only help with memory issues, but also improve the overall gameplay.
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