Thanks for reply! I'm trying to use those <> data elements as you adviced. Below you have a screen from quick try - i'm just inserting text value like "100px" to <width> and <height>
However, in Firebug You can see, that those values didn't go to style="width: 100px; height: 20px" but straight to HTML element.
If it works, I will put all that to one process as you said.
I improved performance from 50 seconds to about 12s. I need about 3s though :) I hope there's an easy solution for problem above.
P.S. I tried the same with Number data type, but it goes similar to element like <div class="calendarBody" width="100" height="20">
For best results, use the Firefox browser..