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The CPU is the main issue. AMD Jaguar Architecture combined with slow clock speeds just don't have the single core performance PCSX2 needs to run.
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Some games work on linux 1.4.0 at almost full speed, like Tales of Destiny director's cut (is really light game for hardware). No idea why but latest builds not worked for me at all. Not even boot. I tested it on arch linux, as this seems to be only version of ps4 linux with full hardware support.
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Kozarovv
You would have to ask a dev as to what changed between 1.4.0 and whatever build you tried, but if you want to help them narrow down why it does not work then...
Take a build about half as new (in relation to 1.4.0 as the one you tried and see if it works. If it does then take one half as old, if it does not then half as new again. repeat until you find the oldest build that does not work.
Kernel
Unless there is a massive optimization found then odds are demanding titles (MGS3 is defiantly one of them) will probably never run at full (or even playable) speed. Basically anything with the CPU intensive tag on the PCSX2 wiki is going to be a no go, besides tech demo.
AS far as Sony's "emulator" it is like PoPs (Playstation on PSP, Sony's psx emulator for the psp), for the games it works with it should be faster then anything you could run from anyone else on the hardware. This comes from Sony knowing the ins and outs of both hardware and being to write for that specific hardware and take advantage of things that would just break an emulator that had to work on different setups. This also means that the tricks they use will probably cause some portion of the PS2 library to never be playable and updates to fix games Sony wants to sell can and will break other games that were working on other versions. These are some of the sacrifices you pay to get the speed that they get.
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(06-18-2018, 03:47 PM)Kernel_panic Wrote: Thanks, dude!!.. i get it now
I wanted to play some ps2 games on my PS4 using linux but i realized it is not powerful enough to do that..
Is it possible to modify the Sony's "emulator" or not? 
ask Sony for the source code...
Not sure they will answer you, though
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