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I used to run at 99% for months on end with old versions of SER. That doesn't hurt anything.
But I have to say that more recent versions tend to use a lot lower CPU, typically averaging at 50%. So I do find that unusual.
That RAM is very close to the limit - I would be more concerned with that as SER can use 1.2GB by itself. Then add the Windows platform, CB, etc. and you are walking a very fine line.
Usually we recommend about 10 threads per proxy, so you are fine at 300. However, I think it is worthwhile to test in both directions (higher/lower) to see what happens. Some VPS's react differently.
At face value it looks very strong, and you should be pleased with that unit.
I'm not sure why you think something is wrong? Are you making an acceptable number of links? How many projects are you running? Are you using the scheduler? If yes, how many projects are you running at once? (You can only run so many at once on a VPS before the CPU starts gagging). What are your project limits (# of links) that you have set on T1's? On lower tiers?
As you can see, there are so many variables. And I think you are making an assumption you are having a problem. 99% still doesn't mean you have a problem. If you have any issues, it may lie with your overall settings.
Sometimes I lower the threads by 50% and still make the same # of links. Not that unusual. That is why you should actually count the verified links for something like 6 hours on one setting (like 100 threads), and then count the verified links for another 6 hours at 300 threads. Etc. I think you are looking at the controls, and expect to see something that isn't happening (and you think it is wrong when it isn't).
Could you do a little test like this:
1. Make one dummy project with all engines checked except maybe videos and some other that require Document and image from you. Load it with only this blue list via Import Tagret URLs - From Sitelist. Set around 300 threads and measure CPU load. And also measure it for low threads count, like 50.
2. Make another dummy project with same settings, load it with your list instead and measure performance.
Does it really different then?
I have no Serlists but I have also some CPU problems and it would be interesting to know that maybe some engines put a lot of strain on CPU? Maybe you could also show stats from both lists (if its okay) via Tools to see what engines are most common?