HELP ME PLEASE =(

[andresbmxvina]

hello everyone, let me explain, the issue is that I need to remove existing track objects to improve performance on my low-end pc, I have tried using codes like
[SHADER_REPLACEMENT_...]
LOD_OUT=1
LOD_IN=1000000
MATERIALS =

[SHADER_REPLACEMENT_...]
LOD_OUT=1
LOD_IN=1000000
MESHES=shader:ksTree

still, it's not enough, since in many maps all the buildings are separated by different meshes or materials, and it would take forever to hide them all by copying the name of one by one, that's why I would like to import a map into ks editor and see if From there I can delete part of it, the problem comes when ks editor asks for an fbx file, and I don't know how to convert the kn5 files, how can I get the fmx file of the map to be able to open it with the program and edit it? Is there any other way that I can optimize the maps that I don't know about? Any information is helpful since I find little searching the internet, I am really desperate, thank you very much in advance and best regards