Insanely long ticks running custom modpack

[sablabaesj]

Hello, I made this modpack for some friends on a private server, but something in the pack is causing the ticks to become insanely long. Ive measured 500ms long ticks, while its supposed to be under 50. I have tested on a localhosted server and it says it can't keep up and has to skip 100-500 ticks around every 15 seconds. I used these arguments to launch it (I do not know what most of them do, but i found them online in a forum thread XD):
 -Xmn2G -Xss4M -Xms4G -Xmx4G -XX:+UseLargePages -XX:PermSize=256M -XX:+AggressiveOpts -XX:+UseFastAccessorMethods -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:+UseCompressedStrings -XX:+UseBiasedLocking -Xincgc -XX:MaxGCPauseMillis=10 -XX:SoftRefLRUPolicyMSPerMB=10000 -XX:+CMSParallelRemarkEnabled -XX:ParallelGCThreads=10 -Djava.net.preferIPv4Stack=true

Link to the modpack: http://www.technicpack.net/modpack/boot-n-sabs-booty.647997
All of the mods are listed in the description. 
Do any of you know any solutions to this problem?
Also let me know if there's some important information i forgot to mention.
Thank you

[AetherPirate]

I'd start by removing most of those java args to simplify troubleshooting. 

-Xms4G -Xmx4G -XX:PermSize=256M

I'm no java expert, but this basic setup should be sufficient. 

What are the specs of the machine you are running this on?

 

 

 

[sablabaesj]

What are the specs of the machine you are running this on?

 

 

 

i7 4770K, Asus gtx 770 2GB, 16GB RAM, 128GB SSD + 1,5TB HDD

I had the same problems before adding the arguments tho

[EvilOwl]

Profile it with VisualVM

[sablabaesj]

I profiled it and got these results and I have no idea whatsoever what they mean.