Windows 10: SysMain issue with 1 specific program

Dear Sirs, Recently for about a month or two I have had an issue with SysMain. I never knew of it before even though it was probably there but now have seen that something has changed. I have had a program for about half a year that initially ran fine no problems. In the past month or two I noticed every time I started this program, I had lag and had to wait for quite a while before it would run normally. Finally I looked in Task Manager during one of the lag moments and discovered the lags were caused by SysMain running using up a lot of stuff including Disk. This program was not havi

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SysMain no activity without internet connection?

Hello @RoasterMen *Smile
I have not understood SysMain to be an internet specific related task, so what you observe is interesting.

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I am not suggesting you delete it : Enable or Disable SuperFetch in Windows

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What are you using to determine that SysMain is active or not? Are you saying SysMain service does not start until you connect to the internet?

 

Sysmain Needed or Not

my RAM 6Gb. You said i will get some issues with paging ?
is that different sysmain and pagefiles.sys ?

 

Sysmain Needed or Not

If you are using a spinner type hard disk then leaving Sysmain enabled can help with program opening responsiveness, but it uses RAM to achieve this. Also it takes some time for Sysmain to have an effect, like any caching system it uses algorithms to work out what to keep in the cache and what to discard, so if you use the same programs consistently over a period of time Sysmain can help, however if you use lots of different programs inconsistently then Sysmain is not much help.
Windows already has caching systems other than Sysmain to speed up disk access, so on an SSD (particularly an SSD with DRAM cache) Sysmain may not be of any real benefit.
The best way to determine if it is of benefit to you is to run tests specific to your machine and use case, you can't really ask the internet if something should be off or on since you will get answers that do not relate to your situation.
For me disabling Sysmain (on an all SSD system) reduced the time taken from boot to desktop, and that was the only difference between having it on or off, I tested the apps I usually use and timed how long it took to start them, the difference was negligible to non existent, but that is on my system, with my apps.
Don't get too caught up on the free/ used memory, Windows is very good at managing memory and there is no point having 8Gb of RAM if 6Gb of it remains unused most of the time.
When an app requires memory Windows will release it. With only 6Gb of RAM you are more likely to have issues with paging, which Sysmain can do nothing about.