I can't conclude what's causing this as far as the gamemode is concerned. The new server is running a version very similar to the one on the main server. I've even lowered lots of settings and disabled features that may hog resources and the CPU usage is still averaging 4-5%.
Code:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
29942 minecraf 20 0 12.5g 2.1g 11m S 42 6.8 783:26.99 java
26664 samp 20 0 76832 52m 2680 S 4 0.2 0:50.48 samp03svr
I'm convinced that this issue is not in any way related to the gamemode. CPU usage even whilst running LVDM at times peaked at 2%.
Is this still happening? I already sped up the gamemode by roughly 60 percent, but we can go further if required. MySQL was reinstalled by Peter so hopefully that'll have helped. Maybe updating streamer itself (or fixing the plugin's code..) may be an option. I'll look into it.