Elevate the priority of the process and eliminate hyperthreading in your PC.
As James suggested,
you can set "High Priority" to Mesh Progress through Task Manager...
I would use 'Run' check box inside "Create Mesh", so that would solve after Meshing (provided I know suitable element size) and pre-select solver to LPDS (Run---> Properties) and check...
Thanks James and Ajay,
I changed the priority in task manager and for the moment the situation is much better. Now I have 2.5 GB memory usage instead of 1 GB.
U Welcome Omid...
for reference, in windows there is no way to manage memory, that is done by the CPU
if you have RAM, it will use it
otherwise it goes to page file
i'm not sure how you are reading things but your mesh may only require 1 GB of memory
and meshing time is directly related to CPU and HDD speed, not memory size. solve time is affected by that since if you are using page file, it is slower than ram and will solve slower.