Hello @marc-leblanc-fabify,
I saw your post and I have the same trouble of you but I use the version 3.5.0-rc.3. It is super long to load monaco-editor and the app. The only fix you find for now it is to roll back to the version 3.4.6? 
Best posts made by Fred636
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RE: Slow loading on DWC 3.5.0-rc.2posted in Beta Firmware
Latest posts made by Fred636
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RE: Slow loading on DWC 3.5.0-rc.2posted in Beta Firmware
Hello @marc-leblanc-fabify,
I saw your post and I have the same trouble of you but I use the version 3.5.0-rc.3. It is super long to load monaco-editor and the app. The only fix you find for now it is to roll back to the version 3.4.6?