They have recommended it to me in a forum but they did not tell me how to do it
Well, Zorin does not start, The screen flickers while the system boots, It has a poor graphical performance, it overloads very easily, it writes dots in the texts where I write and the animations lag.
I've been trying to fix all of this for months and already tried everything, this was the last solution I found.
I am using legacy mode
It is Zorin 16 Core and my laptop is a HP ProBook 440 G3 with 12gb of RAM I5-6200U CPU and Intel HD 520 graphics card
Well, when starting from the Live USB, the screen flickers while the system starts the installer and while doing the file system check, and I always hit Install Zorin
since i started using it in august i think i did ten or more reinstalls
Do you know if you have the latest BIOS for your laptop?
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A few weeks ago I installed the latest version, it doesn't fix anything
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Estoy hablando española!
Sorry, I don't speak English very well
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Makes sense, I'm going to install it again without the legacy mode to see how it works
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Intel and Amd microcode are installed by default as mitigation for the spectre & meltdown cpu vulnerabilities.
apt-cache policy intel-microcode
intel-microcode:
Installed: 3.20210608.0ubuntu0.20.04.1
Candidate: 3.20210608.0ubuntu0.20.04.1
Version table:
*** 3.20210608.0ubuntu0.20.04.1 500
500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
100 /var/lib/dpkg/status
3.20191115.1ubuntu3 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
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I have processor with gpu i7 4790k. Could be why on Zorin Pro sometimes i have black screen? In bios i have off. Screen i have from PCI-Express 3.0 that's means this could be a problem processor Intel some "virus" a spectre or meltdown???
Done, I already installed Zorin Os in UEFI and a few things changed, animations are smoother, video performance improved, and the system feels more stable overall (y ahora ves el logotipo de mi fabricante junto al de Zorin al Arrancar 
)
But the screen still flickers on boot and my PC still writes dots if I put it in Hibernate
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I do not think so.
What I understand is that this mitigation related slow down would only affect commercial servers and not average users.
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What gpu do you have ?
@Bourne
This thread even does not concern you.
You have AMD CPU not Intel CPU.
Intel Corporation Skylake GT2 [HD Graphics 520]
My processor is Intel not AMD.
