It is true that a chess engine tends to use a great amount of memory for its hash to store generated moves (of which there are tipically tens of millions). On the other hand once started it never 'sleeps' so consumes CPU resources as well - all the way long.
in reply to Re: Set thread quantum for process under Windows
in thread Set thread quantum for process under Windows
Still: lowering the priority of the engine process has worked for me. Now I can open web pages even play online with the engine running in the background.