second display and high Sierra - split second delays

Hello

My Mac was working perfectly fine but since connecting a second display through a thunderbolt (display port) to DVI adapter the Mac almost immediately began to experience intermittent (half second) delays. The delays manifest as a spinning beachball. It will appear as I click on menu items or typing gets buffered and then outputs to the screen as the buffer is released. Photoshop is no longer a smooth experience with some tools (like brushes) stalling until I click somewhere on the art work.

High Sierra Version 10.13.6 (17G7024)

Eizo display (DVI) - model EV2316W - it has D-Sub that I can try but haven't yet.

Not in order, I did the following

• I ran Disk Utility
• All maintenance operation in Onyx (exceptions were made to Spotlight Index, Mail's mailboxes, Disk position on the desktop),
• Removed all my user account Preferences files ~/Library/Preferences out so that new plist files were forced to spawn in default configs
• started in safe mode
• even reset PRAM, SMC
• reinstalled Mac OS (not an erase and install) in recovery mode
• Manually removed all ~/Library/Cache files
• New user account created and logged into but the issue is reproducible.

Is there an update that I am missing? Some software that can fix this or could it be the DisplayPort dongle? I need a solid solution or I simply can't use the display, the lags have an unacceptable performance hit. If I need to buy the Apple DisplayPort to DVI dongle I will do it if it solves the problem.

I've used this dongle on my MacBook Air to a Sharp 1080 TV (via DVI) and there was no such issue. I only mention this to demonstrate that the dongle works.

For those of you who might be expert enough, I have included a Google Drive link to the EtreCheck report in the hopes you see something that I was not able to.

Kind regards and thank you for considering the issue and any steps that I might be able to take.

EDIT: It appears the link tool in the toolbar doesn't work so here is the link for the report. https://drive.google.com/file/d/1waOXjuER15-ZtIrc4-3lMvuYgng_mQJC/view?usp=sharing