The game is excellent. Works better here than Steam. Steam has a frame time issue, here it's fixed. You must cap the FPS at 60, this makes the game less glitchy and jumps more precise. This game has very dull colours so reshade mod is recommended. Check Steve of War Tomb Raider Anniversary retrospective on Youtube for more info.
The Steam version of this game has severe frame passing, stutter, missing textures and crashing problems when Next Gen Content is enabled. GOG version works perfectly without stutter even with Nex Gen activated. This is quite close to PS3 version. Gongrats GOG team for fixing the game.