It'll handle it very well, one of the best on the market. Stellaris is extremely poorly optimized, like most Paradox games so there is only so much performance you can squeeze out of it. If you play on huge galaxies with many fleets, it will still lag into the 10 fps range, only somewhat dependent on your GPU. I believe they are doing something to performance in the next patch, which is a very welcome change.
Always disable Xeno Compatibility. Playing genocidal empires also helps with lag due to fewer pops and fewer species.