Minecraft server lags every minute?

I started up a minecraft server with my friends with about 5gb with the run bat file and yet the server will run smoothly for about 30 seconds to a minute then a MAJOR lag will occur and this procces will repeat. When i look at my server it says its only using 148 memory and 98% is free. I dont get this, is there a... show more I started up a minecraft server with my friends with about 5gb with the run bat file and yet the server will run smoothly for about 30 seconds to a minute then a MAJOR lag will occur and this procces will repeat. When i look at my server it says its only using 148 memory and 98% is free. I dont get this, is there a way i can force it to use more memory?
Heres my pc:
Model:Presario CQ61 Notebook PC
Processor: AMD(tm) M120 2.10GHz
Ram: 3.00 GB (2.75 GB usable) also my virtual memory paging file is set to 10000
64-bit operating system
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