I would post this question directly on the Apple discussion site, but it appears to be having issues (if I log in, I get a redirect loop leading to browser error message).
I believe this issue could be related to the High Sierra update, as I believe I started seeing this issue sometime after updating.
When hovering over certain areas, the pointer rapidly switches between cursors and the mouse movement speed lags heavily. This happens the same whether I'm using the trackpad or a USB mouse.
Previously, I thought that the issue was isolated to a single application, WebStorm, and I thought that it was isolated to only hovering over hyperlinks, when the mouse cursor attempts to change to the hand icon. It would rapidly change between the hand and the text cursor and the mouse would get stuck there because it gets slowed and choppy while hovering over that text.
However, I recently noticed this happen in Google Chrome as well. Specifically (and consistently), when you enter a password for a website and the "key" icon shows up in the address bar, it asks if you want Google Smart Lock to save the password...when hovering over the white space next to that text in the bubble, it does the same thing, switching between the arrow and the text cursor.
I searched, but I can't find anyone else that seems to be experiencing quite the same issue. Others have reported issues with the mouse cursor, but not exactly the same problem I'm seeing.
I may try and revert back to regular Sierra, but I wanted to see if anyone else is seeing the same thing or has any idea how to fix it?
Here is a video showing the issue in WebStorm: https://imgur.com/m00slwn
And here is a video showing the issue in Chrome: https://imgur.com/gsKM0mn
The screencast doesn't capture the mouse cursor rapidly changing, especially in the Chrome video, but it is much more drastic than shown in the video.