DOpusRT is the 2nd Opus entry there. (Task Manager's Details tab shows the process names.)
Everything there looks correct for a quick launch.
Something Opus is accessing must be taking a while to load or cache the first time a window opens (or first time in a while that one opens). What it is could be a number of things, depending on your Opus configuration and PC configuration.
If you're familiar with a tool like Process Monitor, using that can quickly locate what is being accessed during the delay. If you aren't familiar with it then it might be a bit overwhelming, though.
Some of the suggestions here are worth trying if they seem relevant, as a quick list of possible things to try. (Ignore any that don't seem relevant, of course.)