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Who is your server host? If you are hosting the server on your own hardware, what are the specs of the hardware(especially CPU. Please give model/model number of the CPU)?
@Lyra_Chan I have a bunch of games I could zip up and send ya if you want. Skyrim, bunch of emulator games, some Final Fantasy. If you have any specific requests, I can take a look at my media drive and see if I have it.
Why not wait for Zen from AMD? There's a lot of leaks saying it will be on par with Haswell/Broadwell. So imagine 8 physical Haswell cores for the price of an i7 with only 4 physical cores.
I don't think Opis will help much here. You want something like VisualVM(a Java profiler). OPIS just watches during gameplay. You want something that watches the usage before and during, and after world loading. But of course, first try Opis.
I believe I know why fast math drops your frames. Fast math is optimized to make better use of the cpu cache, which normally is a good thing(less latency means your processor can work faster.) But...this is one of piledriver's many weaknesses. The cache isn't as optimized as it should be, which...
I'm guessing that giant increase in FPS comes from the multicore rendering optifine can do, which makes a lot of sense. That is Piledriver's specialty after all. As for mipmapping, a lot of people with AMD cards are reporting the same. Perhaps I should see what difference it makes on my r9 270...
I can only think of one last thing to try. Try installing a distro of linux (such as ubuntu or linux mint) on a small partition. Install the AMD open source drivers and Java 8, then copy over your save file and mc files(windows partition is fully accessible from within linux). If your FPS in...
Hmm. Does your cpu maintain it's clocks while playing? I've seen several instances on /r/buildapc where people were having issues with FPS, and it turned out that the cpu was downclocking itself for no reason.
This all points toward a CPU bottleneck, which should not be happening at all... Does cranking up your clockspeed help at all? Also, does setting the cpu affinity for Minecraft to your third or fourth core help?
How much RAM do you dedicate? Too little and it'll be doing a lot of garbage collection, causing constant FPS drops. Too much and each garbage collection will cause massive drops. Also, try setting the Minecraft client to use a different core using task manager.