Memory usage of Tukui starts to rise when coordinates are being shown.
open the zone map, start running/auto running so coordinates will change and keep an eye out on the memory usage.
I noticed this while working on my locator frame version for MaxUI. My coordinates are showing all the time and the memory usage of MaxUI was rising each second from 664kb to 5.45mb in 10 secs.
closing the zone map/reopening will reset the memory used though.