In fixed spools.
Spool profile will influence line lay and in casting how it comes off the spool. A longer spool
that is narrow throws smaller loops from the spool resulting in smaller loops passing through guides and more loops(line) coming off faster in the cast equals more distance.
An osolating bail arm that lays the line differently on the up wind to the downwind means less resistance to each wrap of line as they each come off the spool. This is of lttle use though if the line lay does not lay line evenly throughout the osolation but creates bumps and hollows this will create resistance to each loop of line thus robbing distance.
Daiwa have also used a spool that is wider at the top than the base the idea being the spool will throw each loop from the spool.
This clip shows how to load the line correctly label up personally I wet the line first helps it to bed down on the spool and I would not use Red Ice, cheap and springy Other Ultima lines are much better.
Hope this helps.