There is currently an issue with game sounds in PoE 2 that causes unusual lag.
You can make it somewhat better using in game settings by changing "channel count" to low.
To make it a LOT better, go to (in windows) documents\My Games\Path of Exile 2 -> poe2_production_config.ini and under [SOUND] change as many options to "false" (NOT 0, which turns the volume off, but still accesses the sound files) as you can tolerate.
GL!
Send them an invoice for "outside consultation and development" at roughly triple your current wage