I actually posted replies on this thread and others (with chatlog link to imgur), but it's still under approval process my mods here for some reason.
So here's my reply on Reddit. I'm CaptnBanana. The workaround only improves the frame a litle bit.
I've chatted with Nokia Support on the Support app. The rep has confirmed that the fix for the UI frame drops will be in this month's (June 2018) patch.