Over 4 times the slowdown?? I get 800kb instead of 100kbs. Thats like 8x times slower.

It's not just that script, I have dozens of other scripts which use various not just string functions which show the same effect. Some scripted functions that I use take up to 30 times as long as on 6.21. Thats why i dont use mirc 7.x wherever I need scripting performance in combination with mirc. Im very well aware of the unicode change, and yet the speed difference is much higher.
I profiled most of my time intensive functions, and e.g. having either 30secs to finish up a task or 1s is def noticeable, but that aint the topic here anyway.
All that matters for this particular posting here is, that I have 800kb with mirc 7.27 on the exact same system while on on 6.21 I get 100kb/s~ by using ssl dcc transfers.
Same at my mates computer, but either way if khaleb should add it natively, that wouldnt matter, since unwrapped native calls would be much more efficient. Which I Hope. At the moment I can only receive ssl transfers via mirc from other sources.
Technically it would be also possible to wrap passive dcc sends..., to have also outgoing sends running, that wouldnt allow mirc to mirc sends but at least mirc to !mirc.