I am going out on a limb here but my thoughts are these.
If you have a lot of notes to play in a limited time. Say 12 notes per beat in 4/4. That is 48 notes in 1 second. There may be a few ways to slay the dragon. You slow the track. Or you can dissect the notes. They are all in the key or they wouldn't be there. So play every 2nd note (you will have to write them down or you will get lost)and let these 24 notes fill the bar.
From there you can slowly add a note until you reach speed. Or play only every 4th note and let them fill the bar. Then add on.
This is not by any means the silver bullet but it may help.
This is like when learning the chords to a song you might only strum 1 time on the chord until the chord change and strum once on the change, etc. Then you strum 2x etc.
Don't know if this helps or makes sense but I think it is worth exploring.
All I am saying is you don't have to play every note for the solo to sound good. Just slowly and methodically add as you feel comfortable. This way you keep playing a great solo with a great sound until you get to the original. Heck you may find you like your version better than tabbed and that is just awesome.