I was experiencing the same thing, it was a pain in the ass, to be honest.
So after days and days of tinkering, I found out that this wasn't caused by Kitserver loading all necessary files (this usually takes seconds on modern computers). The problem is Windows Defender, and possibly another antivirus software, so you need to go to the Windows Defender settings and add the whole WE9LE folder to the exclusions list, maybe even the .exe file to the exe exclusions below that. Do the same for the antivirus.
To avoid crashes, be sure to use Kingsley's wonderful mods and tools from this thread:
https://www.evo-web.co.uk/threads/pes6-pes5-we9-we9-le-ball-physics-update-for-pes6-v1-0-beta.76214/
Look at the PES 5 / WE9LE section and the Extras section. You can use 1.0 which includes only the Reserved Memory Fix which would sort out the crashes, you can also use the other ones which offer higher internal resolutions, weather effects improvements, some changes to the ball physics and gameplay as well! Make sure if you're using v2.0 and above of his .exe file (i.e. including the internal resolution changes) that you select the proper graphics setting in the settings.exe - so Low for Full HD (1920x1080) internal, Medium for Super HD, High for Ultra HD. You said you have a laptop, so I assume it doesn't support 4K, which means you have to use Low (which isn't low quality by any means btw, it's more than enough for a laptop screen at 1080p).
If you have stuttering and/or vsync problems, let me know and I can explain how I have fixed mine.
