[bug #61190] Vary slow rendering speen with HiDPI screen

[Yu ShenHang]

URL:
  <https://savannah.gnu.org/bugs/?61190>

                 Summary: Vary slow rendering speen with HiDPI screen
                 Project: GNU GRUB
            Submitted by: sky96111
            Submitted on: Sun 19 Sep 2021 02:28:27 PM UTC
                Category: User Interface
                Severity: Major
                Priority: 5 - Normal
              Item Group: Hardware-specific
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: 2.02~rc1
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

reproduce:
1. Link a high resolution screen
2. Install GRUB and config GRUB_GFXMODE=3840x2160 to fit screen resolution
3. remake grub.cfg

what it should be:
GUI rendering and system selection should be immediately respond

what actually be:
In my two devices, GRUB renders very slow and lags. After OEM logo disappear,
it almost take 4 seconds to finish rendering first GUI scene. And after
finishing rendering, every key pressed (Arr up, arr down, enter) lagged for 1
second to respond, I even cannot select correct system.

If I config GRUB_GFXMODE to 1080p, the problem will disappear, but the clarity
of the windows and linux startup interface will decrease.

It seems other person with certain hardware are facing the same problem.
https://askubuntu.com/questions/1227735/grub-is-extremely-slow-1-second-per-key-input

device1 info:
Arch Linux
GRUB 2.06-2
3840x2160 screen
NVIDIA GTX1070 GPU
AMD Ryzen 1700 CPU

device2 info:
Fedora 34 Or Arch Linux
GRUB 2.02 Or 2.06-2
2736x1824 screen
Mesa Intel Iris(R) Plus Graphics(ICL GT2) GPU
Intel i7-1065G7 CPU





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