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I'm encountered an issue with my server's performance. Out of the blue, it slowed down significantly. After contacting my hosting provider, they assured me that everything looks fine on their end. I've inspected hardware monitoring, which shows that I'm using only 15% CPU, 60% HDD capacity, 40% RAM, and so on.

What confuses me is that the problem vanishes for a brief period (about 1 hour) each time I reboot my server.

I've also checked the processes and system health, but nothing appears...

Server Slowdown: Only Resolved by Rebooting