Since the 18w15a snapshot released (I know it's late but better late than never!) my worlds have become a lot laggier than they used to be, maybe this happens because the game is consistenly calculating the color the water should have in each biome, and if that's the problem, there should be some optimizations or something.
Back to the point... Before that snapshot I had 40-50+ FPS consistenly, but now, in my worlds or in new worlds I get like 20-30 FPS, and sometimes even lower, and lag spikes are consistently frecuent.
This doesn't only apply to FPS lag, but since that snapshot I've been also experiencing strong entity lag, and drinking lag.
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Same ! Before some snapshot- I don't know which one, but it's definitely a thing- I've been getting around 40-50 fps that dips into the 30s when I move as opposed to a constant 60 with minor dips into the 50s when land loads (moving on its own was fine). I have literally never experienced drinking lag ever until now.
AMD FX-9590 @ 4.1GHz, x2 4Gb DDR3 1900MHz, 120Gb SSD - 380Mb Read / 360Mb Write
I am having this issue too... My normal FPS for singleplayer worlds at 32x32 render distance is about 30 FPS/60 in multiplayer (not great, I know) but in 1.13 I get around 5 FPS at worst but only 10 FPS at best. I have not been able to test this in multiplayer due to the server download being broken/disabled last I checked but I'd assume I'd be getting at most 15-20 FPS.
Here are my system specs (from System Information)
OS: Windows 10 Pro 64 bit
CPU:Â AMD A6-5350M APU with Radeon(tm) HD Graphics, 2.9 GHz, 2 Cores/Logical Processors
RAM: 8GB (7.16 usable)
GPU: AMD Radeon HD 8450G (This is not great due to lots of driver glitches which cause input lag and the computer is slow to react but it can get me pretty decent FPS usually)
I made three flatworlds for further testing:
The first one I made was a void world with nothing in it which was getting me 20 FPS which is less than normal to begin with.
The next world I made was a 100x thick stone flatworld which was getting me 20 FPS standing still but if I would even jump the FPS would drop to about 5 FPS very quickly.
The last world I used the Water World preset which would be to test the theory that water is causing lag and I was getting no more than 3 FPS and a lot of the time less than 1 FPS so it seems that the water is a big part of it but the game itself is a bit laggier.
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Same, i am using Mac and fps is lower than normal.