Actually what alot of folks are experiencing is "pre fetch" lag while either system memory or hard drive caches data to be rendered by the GPU.
If your GPU has low / crappy memory your going to see alot of it. Not much can be done.
Reducing background tasks will help as the system can devote more resources to fetching the data and has more ram available for caching which is a hellua lot faster than fetching off the fixed disk.
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