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Hi, An observation (and a request for advice!): My workstation isn't the most powerful (and I admit is due for an upgrade soon, but with 16GB RAM and a reasonable graphics card it copes well). I have an 80Mb VW (2021) file which has primarily 2D content (including ConnectCAD schematics etc). It is broken down into multiple design layers some of which contain viewports to a single reference file which has multiple DWG's imported into it (imported to separate layers (level 00, Level01, level 02 of my building) - They are my backgrounds from the architect, on to which I put my content over on a separate design layer. On starting up VW2021 I am using 8 out of my 16Gb RAM with a further 1Gb added when I open the file ... I can work all day in schematics etc and performance is OK. If I start showing other design layers the RAM usage goes up (no surprise there)... If I show all layers simultaneously I go over my 16Gb max and start using paging files/virtual RAM which is really poor performance. BUT.. if I then hide all the layers the RAM usage remains the same (ready to be displayed for later I guess). But at 16+GB the performance is dreadful (barely workable). Is there any way I can 'flush out the RAM'? or is there a setting somewhere to manage my memory usage, layer display etc? Thanks, R