GOG could give the option to choose between two modes (classic at 40fps/enhanced at 60fps).but hey, it's GOG, they're not going to do anything at all.

This is the the usual bare minimum release.

Original CD version has 40 PFS timing, due to incorrect timing realization.

Also the CD version has timing problems with Inventory animation, World Map and Eagle Eye. To be clear it doesn't have timing at all. All animations there are very fast on nowaday CPUs.

GOG has fixed and added timing with 30 fps for Inventory, World Map and Eagle Eye. But the rest of the game still has the same 40 fps speed.

So, the game runs on 40 fps and Inventory, World Map and Eagle Eye - 30 fps.

Verok's patch has 60 fps speed for whole game, same as PS1

They do exactly that.

You want classic 40 fps? Play the vanilla GOG version.

You want enhanced 60 fps as well as some other (unofficial) enhancements? Install the Verok's mod over the GOG version.

Problem? None, but whiners are going to whine anyway.

There ain't nothing classic about it. It's a bug and it shouldn't be there at all. I know what to do to have the proper version of the game. A lot of other people are just going to install and play and they'll get a worse version. If they are first time players, it will affect their impression of the game. I don't know about you, but I consider this an unacceptable situation.

You test FPS\timing limits(cycles) on actual Windows OS from actual game (CD, with authentic DRM CD-check exe?) or on nowadays WindowsNT OS?
I didnt test every solutions online. I know some of them remove zoom option with removing 240p resolution - and that is wrong. Zoom originally available exactly in 480p mode.
So this solutions online - they from not lamers of course. But some mistakes happened. GOG not lamers as well, and again - mistakes happened, as well.
So only Verok\DxWnd\dege\narzoul\etc and they forks wrappers is best solutions - without modding exe\any files.
And GOG wrapper is a good tweak-tool too. Most builds of it can be used for many old games.

Is there a way to speed up gameplay in the GOG version without unofficial patches ?

No, the GOG version runs at the same framerate as the PC version originally did. It was restricted to run at only 42 fps instead of the 60 fps the PS1 version ran at. For all intents and purposes, the GOG version is exactly the same as the original PC release. The only way you'll get 60 fps like the PS1 version is by applying Verok's mod.

I explain. There is some cheat trainers one of function of which ones is speed-up Kain. As Wrace explained - on this video is Cheat Engine used.
Maybe there is a point - even on 60 FPS Kain a little bit slowly. But that be cheating anyway - to run faster just use Werewolf form.

I am not talking about fps. I think it is possible to speed up gameplay by modifying the exe.

This is "unofficial patches". So no, without anything 3rd-party you cant make game faster. Use cheat trainer for that. But that cheating. Or use Wolf form.

Increase FPS to 60 by using Verok's wrapper. FPS affect game speed (as always).

Well, actually Verok's patch does not modify the .exe, it's a .dll that injects extra stuff.

In this game, as is the case with many old PC games, the game speed is tied to the framerate. If you use a 3rd party mod or application to speed up the frame rate, you speed up the game.

QWEEDDYZ,KentGAllard,wh1tepointer.

Thanks a lot for your answers.

Verok's and gog's mods are the same "cheat trainers" which modify memory of process and it is exactly the same as modifying of exe (without modifying physical exe).

In the video the speed of movement of Werewolf is also doubled, so you will move 2 times faster than when you use this form in the usual game.

If you wiil increase frame rate, you will speed up ALL movement in the game, including the movement of enemies and other objects. And you will not obtain 3x normal speed of movement in the Myst form and for enemies under control.

About using 3rd party software and so on - if Verok will include such additional options in the starting dialog of his mod, you will not need to install and use any additional software to have these (optional) features in the game if you wish them.