maybe it's not about the specs but something else.
One suspicion I have is that running a bunch of Chrome services was affecting my PC's performance, and somehow especially that of DO11.
Normally I have a Chrome browser open with Calendar, Drive, and several Google Sheets, as well as WorkFlowy running in a stand-alone Chrome app. (The local Google Drive directory was also pre-set in a Dopus tab, although it was set not to load automatically.) This normally would result in a large number of Google processes running under the hood, with significant RAM usage.
After I shut down Chrome and ran the same Google and WorkFlowy web pages in Firefox instead, the performance of my PC had improved significantly. Unfortunately I can't test this theory with DO11 because I uninstalled it, but even DO10 performance had improved noticeably.
P.S. And the other suspicion is about a scheduled Malwarebytes scan kicking in without me realising it, which slows things down... It was set to kick in daily (by default, I presume), so I just changed it to weekly...