@Tumyeto: Your PC config seems enough for GP4 but I must admit that the lods of the cars and textures are heavy and that we have probably reach the limits for this game, this year. Lower lods allows to reduce the PO when the cars are far from the camera or at the other side of the tracks ( lod_4 when they are invisible on the screen). But, when you have heavy lods_0 , lower lods and lod_1 are also heavy to avoid objects and faces disruptions and to keep the best quality possible. Most of our textures are also in HD (4096x4096)
I don't know if they have been converted in 2048x2048 for the mod. However, there are several things that you can do:
1- reduce the main textures in 2048x2048 (each 4096x4096 texture weigts about 21mo.... about 5mo in 2048x2048)
2- Into Gpxpatch, GPxTrack tab, set the Max track lenght to 10kms: It fixed my problem of freezes, crashs and memory during a long race because of tyre marks on the tracks.
3- Allow GP4 to handle more than 2Gb adress space with CFFExplorer (Open gp4.exe with CFFExplorer, into "file header" , into charachteristics, click on "click here" and into the options, tick the box: "App can handle more than 2GB space adress". Then save your gp4.exe)
Hope that these 3 things will improve your flow...
I am playing GP4 on an Intel Core I5 2500K, 3,30Ghz, 8Go ram, GTX 560 TI (1024mo) with lods_0 forced only, 4096x4096 main textures and the game runs with a PO between 35 and 60% on all tracks, (excepted at the start: up to 110%) and when I am close from the Pitstands in race (up to 80-90%) but the procedure 2- and 3- really improved my PO..... Sometimes , the PO is also increasing regarding tracks but some, despite their wad weight are really optimized, like the Red Bull ring or Sochi by Gezere (no more than 30% in game )
I precise that I am playing non-csm 2016 season, however....
____________________________________________________________________________________________________________________________________________