In my log files, these messages keep showing up:

[01:23:40] [Chunk Renderer 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[01:23:51] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
[01:23:54] [Chunk Renderer 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[01:23:57] [Chunk Renderer 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[01:23:59] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
[01:24:01] [Chunk Renderer 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[01:24:15] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
[01:24:21] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
[01:24:24] [Chunk Renderer 1/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[01:24:28] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:none
[01:25:30] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2104ms behind, skipping 42 tick(s)