Why is memory not freed on the server?

Question

System administration

There is a windows 2012 r2 server
After rebooting the free memory is 85% (6 gigs in total)
I start 1s in file mode (SQL is turned off, not used) - the memory is all eaten up and about 5% remains.
Fig with him. I close 1C. In processes, 1s disappears, but the memory is not returned.
Why and what to do? In what direction to dig?
According to Microsoft's system utilities, I found that the memory is eating tag31. I don't know what this process is.

Answer 1

Platform number 1C can influence.
Try to put on higher)