I recently backed up my copy of initial d for ps2. I used DVD Decrypter to rip it and also to burn it. I burned it at the slowest possible time wich i believe was 2.4x. I used a verbatim DVD+R on my TssTcorp dvd burner. I also make a copy of another game and it too had a very long loading times. Im using swap magic on a slim v12 ps2. I was reading a thing on book keeping or something that made the ps2 thing the DVD+R was a DVD-R but DVD Decrypter doesnt support a Tsstcorp burner. Can someone please help? Thanks!
Probably your media and writer combination is not the best (to be honest, Samsung + Toshiba never produced any realiable burner, so no wonder) Give a try to another media (Verbatim 8X -, TY) and see what happens. Also remember if there are bad lasers on the earth, then PS2 lasers especially the slims are those. 
So before burning out your PS2 lasers, try other media. And slow speed usually does not result in better burns, especially when you use today’s high speed disks/writers. Booktype has nothing to do with your case, it’s good for better media compatibility when the DVD+R cannot be identified, but any PS2 above V4 could identify the ‘plus’ media with no problem. And the booktype cannot help on your bad burn quality…
regards, Stephen