I have been using an Acer laptop to run Minecraft for some time now, and I have random FPS drops, even while using optifine. I could be at 40-60 FPS and then suddenly just hit a huge lag spike and drop to 5 FPS. My computer is an AMDV120 Proccessor Acer with 3.00 MB of memory. My adaptor is an ATI mobility Radeon HD 4250. If anyone can help please do!!! Thanks!
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Retired StaffPlease provide your DxDiag log for your full system specs.
http://www.minecraftforum.net/topic/1742903-obtaining-a-dxdiag-log/
Please also refer to this guide for general tips on how to enhance peformance.
http://www.minecraftforum.net/topic/343030-minecraft-speedoptimization-guide-v-23-6-updated-on-aug-6/