Resource pack switching processes everything rather than just changed items in the new pack

When a resource pack is loaded, the launcher is designed to recalculate / reprocess everything rather than just the items that have changed in the pack. Over the years, this has resulted in crashes and extremely high, unacceptable system load from users that don't have the best machines. Servers are lots of the time forced to abandon resource packs because their users cannot apply them from in game without their client crashing. Will we ever get this changed to where applying a resource pack JUST updates what has been changed, rather than everything? This is clearly a bug / design flaw.