Okay annoying IT guy moment but are you SURE 144hz is selected in your monitor settings? Sometimes I've found a new OS (both windows and linux) can default to 60hz.
Secondly, this will depend on your Distro, but you will want to make sure youre using the official Nvidia drivers, rather than open source drivers (called "Nouveau" usually) that some may default to. The open source drivers are OK but for newer cards are inferior and prone to weird bugs (such as stuttering, potentially!).
I can't really help you figure out what drivers you're using or how to switch them as I have an all-AMD system and dont know your Distro. However, this is a very common task when setting up a Linux system so you can literally search "official nvidia drivers install" and you'll be able to find relevant (and developer-recommended) info.
Of course, the usual warnings of don't copy paste random commands you don't understand apple, because thats how you end up breaking things and reinstalling everything. I have enjoyed this many times, lol.
Finally, this is a tangent since you mentioned dual booting: be careful!
Bonus unsolicited advice
Dualbooting setups are usually fickle thanks to Windows and Linux using two different programs (called bootloaders) to start themselves. If one updates and becomes incompatible the other, you may not be able to (easily) boot into one of your operating systems. IF this happens, you don't need to panic: your data is safe. It's usually easier to just backup sensitive data to the working OS and reinstall the other (or just delete it for good).
If you had Windows and Linux on different physical drives (ie. one SSD with Linux, one with Windows) then this is usually not an issue, and your BIOS can find both systems independently without risks of cross-contamination.
I won't guarantee you'll have issues, some people go years fine! I won't guarantee it's risk free either, but there's mitigations and ways to prepare yourself if it goes wrong.