CgDevTools 1.7 has a new design-time rendering scheme,
Much faster and reliable, less memory needed, less threads, less wait to close the frames/forms.
Only possible with the amazing CEF and its Delphi's implementation: TChromium
https://code.google.com/p/delphichromiumembedded/
If you feel heavy, please donate to keep this wonderful tool going :)
CEF3 it still needs some founds to be finished.
Thanks