Text panel display issue

Hi!
What’s the status on this one?
It seems indeed that the flicker issue has been solved.

However, I’m now facing with extremely annoying lags/poor responsivity of both annotation window and panel.

When I select one dimension or leader, it takes 2-3 seconds to refresh the panel / open the edition window:

It also lags when deselecting an annotation (object selected, click in empty zone):

Another extremely frustrating issue: when I append some extra comment in a dimension/edit a leader, it is absolutely not keyboard responsive and takes ages to refresh:

Sample file:annotation freeze.3dm (33.7 KB)

System infos:

Rhino 6 SR17 2019-8-20 (Rhino 6, 6.17.19232.11391, Git hash:master @     f5754588549c26ce24b886a60fb624f269bd149c)
License type: Commercial, build 2019-08-20
License details: LAN Zoo Network Node

Windows 10.0 SR0.0 or greater (Physical RAM: 32Gb)
Machine name:

Non-hybrid graphics.
Primary display and OpenGL: NVIDIA Quadro P2000 (NVidia) Memory: 5GB, Driver date: 7-24-2019 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 431.70

OpenGL Settings
  Safe mode: Off
  Use accelerated hardware modes: On
  Redraw scene when viewports are exposed: On
  
  Anti-alias mode: 8x
  Mip Map Filtering: Linear
  Anisotropic Filtering Mode: Height
  
  Vendor Name: NVIDIA Corporation
  Render version: 4.6
  Shading Language: 4.60 NVIDIA
  Driver Date: 7-24-2019
  Driver Version: 26.21.14.3170
  Maximum Texture size: 32768 x 32768
  Z-Buffer depth: 24 bits
  Maximum Viewport size: 32768 x 32768
  Total Video Memory: 5 GB
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