If you're using an iPad, please check this guide for help.
Try the following things:
Restart your browser
Make sure you're using a recommended browser (you can find the list above)
Close all other browser tabs
Close all other applications
Restart your computer
Create a new canvas with 1920 x 1080 size and see if the problem happens there as well (sometimes large size or a large number of layers can be the cause of lag)
Turn off the "stabilization" feature (it helps to draw smooth stokes, but sometimes it might be perceived as a lag since it delays the time between pen or mouse move, and the actual drawing appearing on the screen)
Open `Edit -> Application settings` and turn on checkbox next to *"Disable graphics acceleration"* (in cases of some graphic cards this might help — but if it doesn't, it's better to turn it back off)
If nothing above helps and you're still experiencing the lag contact our support team including the following information:
your software & hardware specification
link to canvas when the issue is happening
browser performance report (read here to learn how to prepare it)
(optional) recording presenting the lag