Server lags a lot after adding only two mods

After adding one or two mods to my 87 mod server, the server keeps constantly lagging and stuttering. Everything stops and it lasts for around 10 seconds after that it goes back to normal and the same thing happens every 10-15 seconds and it makes the server virtually unplayable. The mods we added were OpenComputers and Mystical Agriculture.

Please help!

Quote from JinShintaro

From what i know, OpenComputers cause allot of lag

Idk if the mod ComputerCraft is an option for FTB modpack, but i should use ComputerCraft and delete OpenComputers to get rid of the lag

It still isn't working properly. I don't know how to fix this, and its getting real annoying.