Before you say there isn't a known solution, hear me out!
A few people were able to fix the Joy-Con input lag with an app called Bluetooth Auto Connect (see here). Now, I DID get this working, but I'm not sure how I did it, what settings I changed, etc.
I've searched this up, but I only found out how to make DS3/DS4 controllers work with this, which is pretty useless because they connect differently than the Joy-Con's / Pro Controller
A few people were able to fix the Joy-Con input lag with an app called Bluetooth Auto Connect (see here). Now, I DID get this working, but I'm not sure how I did it, what settings I changed, etc.
I've searched this up, but I only found out how to make DS3/DS4 controllers work with this, which is pretty useless because they connect differently than the Joy-Con's / Pro Controller