Remux takes a lot longer now

[DaveH50]

It seems remuxing captioning into MP4 format takes much longer in the latest versions 6.1.4.4 for Win, than it did previously. Like 3 or 4 times as long. Same hardware but with a couple Windows updates from last spring. What gives?

[MrGrackle]

We did a speed comparison about 15 versions ago or so. The processing time acts like it hangs for a bit.