I have been facing this problem while sculpting…When i go to higher subdivisions like 5 or 6 using multires modifier, blender slows down… I have 4GB of RAM…Isn’t that enough ? Is there any workaround ? So that I can do detailing without having it slowed down ?
We need more information.
What is the polygon count when level 6 is active, how much RAM is Blender making use of.
What is your CPU, GPU, OS and version (32 or 64)?
A few things you can try;
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Enable VBO’s in user preferences
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Disable double sided faces in the edit properties
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set optimal display in the multi-res modifier panel
If it’s slow while just rotating then chances are you’re pushing your system to it’s limits, if it’s slow while sculpting it could be that, or it could be your base mesh does not have optimally spaced topology.