check your katalon.ini file in the installation folder and change the value for -Xms to 1024, or even 2048. you can tweak also the Xmx value a bit (use it with caution). Since you have 16GB of ram installed, you can go up to, let’s say 4096 for this one.
sample file:
-startup
plugins/org.eclipse.equinox.launcher_1.3.201.v20161025-1711.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.401.v20161122-1740
-data
@noDefault
-vmargs
-Xms1024m
-Xmx2048m
see if there is any improvement.
Follow also the above @kazurayam 's advice to identify possible bottlenecks.
** note also that some antiviruses may slow-down the execution too, if it is the case try to disable the heuristic engine.
see also the advice’s here: