FTB Revelations lags really bad but other modpack runs fine?

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I downloaded the FTB revelations modpack on the newer launcher and it runs very badly on a server at 1 fps at 6gb ram but after installing FTB academy on the old launcher, it runs very smoothly at 2gb ram? How do I get good performance on the FTB revelations modpack too.

 

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I noticed that the fast modpack uses java 1.8.0 271 and the slow modpack uses java 1.8.0 41 or something, is there a way to update the java

 

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I changed it to java 271 but its still only 1 fps

 

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nvm i fixed it by disabling animated textures in foam fix