Bluetooth lagging on Macbook Pro 16 inch 2019 I have a Magic Mouse connected to my new Macbook Pro 2019.
The mouse is horribly lagging. I have another bluetooth device, a pair of Sony headphones, that is working horribly too.
Analysis:

Both devices work perfectly with Macbook Pro 2018 in the very same location.
I suspected interference with the Wifi(2.4 GHz) but when I turned it off the devices were still lagging
Both devices are 100% charged
The mouse's sensor is clean

I tried to reset PRAM and SMC, removed everything related to mouse from /Library/Preferences/, nothing helps.
BT signal strength on both Macbooks is the same: ~ -52 dBm.
I'd appreciate any help!
macOS version: Catalina 10.15.5
Interference in the 2.4 GHz range is very hard to measure and even harder to control.
Look to eliminate every single USB-C connection within 10 feet of either device to ensure you’re not generating the interference right next to the Bluetooth receiver on the Mac.

https://support.apple.com/en-us/HT201163
https://support.apple.com/en-us/HT201542

If your display connects via Thinderbolt 3 or USB-C this testing is not ideal but necessary. I have had one person add a USB Bluetooth low energy dongle at the end of a 6 foot (2m) type cable and tape / attach it to the wall next to where they sit so they escape interference close to the Mac. Most of the time, we use another radio frequency if the interference is coming from too close to eliminate.
Also, all sorts of electronics and motors can cause the interference, check everything in 30 foot range if you can’t get an actual tool to measure the RFI.