Over the past couple of days I've noticed the reprojection, retiling and conversion from tif to asc is going really slow is anyone else having this problem. If not do you think it'd be a good idea to uninstall and reinstall QGis?
It depends on the amount of data/tiles you process. I don't know more about your current project but I only guess you maybe make a longer route now than you did before? Therefore, the conversion processes will take much longer. The reason why it takes longer is also when you take a look at the size of the created files. For my project I obtained 220 .asc files at the end of the chain after 1 and half hours, which all occupying 24,5 GByte in total, where each .asc file is about 110 MByte large. For such amounts of data, QGIS needs time to convert and create it. I don't think uninstalling and reinstalling QGIS would make any change since there is no recent QGIS update with such fixed bugs to mention and as long as you didn't changed the installation folders of QGIS manually (which I highly doubt you did). So, I would say, just start the process and give it time (you can go AFK and let the computer and program do its thing) and make sure you have the available disk space for the output path ready as protonmw already mentioned, because if you don't the conversion process in QGIS stucks and emits an according error message after a decent amount of time (which I've experienced several times).
and QGIS creates temporally files in the documents folder which is typically located on c: drive, so you need enough free space there as well at your target storage location.
