Speed of MVD apps

Hi Dmitry and all the rest of MVD fun guys,

What's the best practice to develop faster launching MVD app?
Which are slowing down most?

♦ Using more forms.
♦ Using more tables.
♦ Using a lot of panels and groupbox components on forms.
♦ Using a lot of fields.
♦ A lot of script / code (thousands of lines) if so how to improve script. Does having too many comment and blank lines effects the speed
♦ I can imagine using graphics would slow down, such as image buttons and image form headers. Which image format better beside file size, where images used.
♦ Any other speed killer items.

Where top priorities should be given in order of importance?