Last time I had questions about a mouse, I found this online:

Mouse Event Test Page

It may shed some light on what your mouse is or isn't saying to your computer.

There are sure to be several layers to a mouse interface: the switches and sensors in the mouse itself; the port that the mouse connects to; the driver software that presents the signals from the mouse port to Windows; Windows and the CPU, of course; and the browser or other software that talks/listens to Windows about what mouse or keyboard input there's been recently. If Chrome seems to be getting strange input from the mouse, it won't usually be obvious which layers the problems are in.

The part about typing a whole paragraph before your text starts appearing onscreen sounds like your processor is busy doing something else. If it happened to me (and wasn't just a once-in-a-while thing) I'd want to investigate just what was running that was keeping the processor so busy.

On some sites I visit (including one where I regularly read and bookmark news stories), there seem to be tons of javascript routines that bring everything else to a halt while the page finishes loading. The page may refuse to scroll in the meantime (so I can't read past the first paragraph) and bookmarking it may take 30 seconds or more. I've learned to get around that by clicking on the "Stop loading" button as soon as I'm fairly sure I have the story itself. If I click too soon, I may get just the headline (if that much); if I wait too long, the page may go blank and refuse to redisplay.