I suspect it is a hardware issue, more specifically a to low a level hardware for what you are trying to accomplish. Some have made suggestions to lower the hardware requirements, like wire frame vs. realistic mode for example. these are good suggestions. But lets assume you want realistic view. typically it is a result of too low a CPU or to low a video card ( more likely the case ). to test which is a issue try this... open up task manager and click on performance tab.
now open a file that is problematic. type graphicsconfig and take note if hardware acceleration is on or off. exit out.. for sake of discussion lets say it is on. pan, and zoom around the file. watch the performance graph... what was highest CPU %.? multiple that number times the number of cores your CPU has.... does that = more than 100? if so your CPU is a bottle neck. here is why. Acad is a single thread program. so if you have say a 2,0 ghz quad core. autocad will utlize a total of 2ghz as that is all it recognizes. The cpu may distribute this evenly over 4 cores and appear to only be at 25%. reality is its maxing out.
now if CPU stayed well below that then try turning of hardware acceleration and try again. does it get better? what about CPU utilization now? utilization should go up for sure, and if it runs smoother then your graphics card is too weak for what you are trying to do. time for a upgrade. leave acceleration off till a new card arrives. if it gets worse with acceleration off then graphics card is helping and leave it on, and still consider a new card. if with acceleration on, the CPU is still highly utilized then your CPU is under powered as well. may want to consider a new PC all around, if setting changes are not a option.
hope this helps.
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