Everything is laggy under nvidia/hybrid mode

Describe the bug Whenever I switch to nvidia or to hybrid mode everything starts being laggy, both simple things (terminal, browser) and obviously games.

I tried fiddling with the configuration a bit but nothing changed, what I’ve tried:

[optimus]
pci_power_control=yes

[nvidia]
modeset=yes
DPI=

System info Please include :

• Your distribution Arch Linux 5.8.5-arch1-1 x86_64
• Your desktop manager: KDE
• You display manager: SDDM
• Your laptop model: Dell XPS 15 7590 (GTX 1650, Intel i9-9980HK).
• The version of optimus-manager you are using : latest stable release (Optimus Manager (Client) version 1.3)
• Your custom optimus-manager configuration file at /etc/optimus-manager/optimus-manager.conf, if you made one

Logs switch:

[5] INFO: # Xorg pre-start hook
[5] INFO: Previous state was: {'type': 'pending_pre_xorg_start', 'requested_mode': 'hybrid', 'current_mode': 'intel'}
[5] INFO: Requested mode is: hybrid
[5] INFO: Checking for GDM display servers
[668] INFO: Available modules: ['nouveau', 'bbswitch', 'acpi_call', 'nvidia', 'nvidia_drm', 'nvidia_modeset', 'nvidia_uvm']
[668] INFO: Unloading modules ['nouveau'] (if loaded)
[680] INFO: Setting Nvidia PCI power state to on
[722] INFO: Loading module nvidia
[724] INFO: Loading module nvidia_drm
[1177] INFO: Loaded extra Intel Xorg options (0 lines)
[1177] INFO: Loaded extra Intel Xorg options (0 lines)
[1177] INFO: Writing to /etc/X11/xorg.conf.d/10-optimus-manager.conf
[1177] INFO: Writing state {'type': 'pending_post_xorg_start', 'switch_id': '20200829T175758', 'requested_mode': 'hybrid'}
[1177] INFO: Xorg pre-start hook completed successfully.
[2] INFO: # Xorg post-start hook
[2] INFO: Running /etc/optimus-manager/xsetup-hybrid.sh
[6] INFO: Writing state {'type': 'done', 'switch_id': '20200829T175758', 'current_mode': 'hybrid'}
[6] INFO: Xorg post-start hook completed successfully.

[dgaus]

I am having a similar issue, hybrid mode works fine using the internal display, but as soon as I plug in an external monitor everything becomes extremely choppy. For example playing a 4k video uses 50% of all cores. Thank for the nvidia link, guess we will have to wait a bit.

[xeruf]

Similar problem here on a HP Pavilion laptop running Arch, no display manager, KDE Plasma:

• in intel mode, the external monitor is ignored
• in nvidia and hybrid mode, both monitors work, but the external one lags, while the internal one is just fine

And I just realized that removing optimus-manager completely produces that same behavior…