Hey,
because you have OptiFine there is a LOT of options added to your game to help with framerate issues. If you go into video settings you can mess with the Details, Quality and most importantly the Performace setting added by optifine. Tuning some of the unnecessary setting off can greatly improve your game's quality. Other problems can arise when you have too many programs running, when I record I close all applications but Minecraft and my recording software. Also on your photo you are seen to have 90 fps, that doesn't seem bad at all.
Anyway
Hope I helped!
p.s I can't really tell the difference between 500fps 45fps, its not really about the numbers its more about what you can actually see, but thats just my opinion
1
So...have you tried changing textures?....also here's another solution for you to try before your next reply.
Try updating your drivers according to these steps:
1- Press "Windows" + "R" to open up RUN.
2- Type in "devmgmt.msc"
3- select your graphics card under the "Display adapters" Tab.
4- Press on the "Update Driver" icon on the toolbar.
Hopefully it will work ;D
1
I might need some farther information if i am going to help you...basically is this "certain" server yours?....also does it happen on other servers or on single player?..and i might also need you Graphics Card info...that would be enough.
and you might want to tryout changing textures for example use a clean version of faithful you can get it HERE.
If this server is yours you might check your plugins that has to do with teleportation and search for a corrupted file and just reset it...Good luck ;D