Could be. If it's a modpack and it's installed on the desktop, it could be Windows not liking it there since Windows is trying to annoy keep your computer safe.
Backup your worlds (stick them on your desktop or outside the .minecraft folder) and then try deleting everything in your .minecraft folder and starting from scratch.
Another thing that might help, and I can't be 100% sure since you never provided any PC specs, is playing on a server. Playing SMP versus playing MP usually bumps my framerate up by 10-15. Less heavy processing on my end.
Go to your installed programs and ensure that you only have ONE (the most recent) version of Java installed. Also how much RAM do you have installed on your computer?EDIT: Read through the report closer.
Try disabling (TEMPORARILY) any antivirus software you may have installed.
One of the key aspects to getting people on your server is listing it on other websites and you NEED votes. Without votes, you won't get more people on your server to vote to get more people on your server to vote (etc. etc.). And remember, you need to make your server stand out in some way.
I'd love to take a look and help out. I have another modded FTB Unleashed server up right now that's basically normalized so there's not too much left to do. I've basically set up the entire server myself so I'd have no problem with not letting other's have backend access. If any of this piques your interest, message me here on PMC. Looking forward to hearing back from you.
EDIT: I actually have a question first, is this a home hosted server or are you paying for a host?