So my conclusion is, PDR will do SVRT on a clip up to a point which there is any kind of modifcation e.g. a transition/trim, etc.
It is not smart enough to realize that the transition at the start of the clip will only change like 15 frames of the clip so there is no need to re-render the rest.
My current work around is to let the clip fade to a black image so only the last 15 frames or so of each clip + 30 frames of the black image is rendered without SVRT. It is definitely not the best but I just rendered a 374 seconds vid in 253 seconds (70%! Faster than real time - thank goodness).
Do PDR developer read this? Come on man! It doesn't take much to program and fix this!