Kubuntu: boot time is too slow. screen flickers excessively.
Hardware: AMD Athlon 64 x2 3800+, ATI x1300, 5Gb RAM.
Software: Kubuntu 9.04 beta.
1) Boot system
2) Observe boot process. Look for visual glitches.
Note: CD-ROM has been tested for read errors. It reads perfectly, in particular, CD test from boot menu passes successfully.
I can see at least the following UI glitches:
1) Booting from CD takes quite long time. Maybe this causes effect that graphic boot splash screen disappears, screen switches to text mode and I can see messages about mDNS service startup + other services startup for several seconds. Only then X server is starting. This causes noticeable blinking since video mode switched 2 times (boot splash -> text mode -> X server).
2) When KDE starting, there is strange long pauses while reading from CD-ROM. System does nothing meaningful at these times, CD-ROM just does nothing in such scenario and it is also not looks like system's CPU is very loaded. Then, after some 10-15 seconds reading resumes and KDE boots further. Even if system does something that causes that system MUST wait these seconds for something, it is very smart to pre-cache (i.e. pre-read) data which will be required later so CD-ROM drive does something useful at same time. I suspect there could be made a good improvement in Kubuntu CD-ROM booting speed.
3) When KDE starting further, in the middle screen becomes all-white and looks like KDE crashes or encounters problem. White screen appears for several seconds. Then, looks like KDE loading starts again, KDE's startup progress icons are starting appear from 1st icon again. Looks like it hits disk cache and load occurs much faster than before. At this point KDE able to load successfully.
System should load faster and without such awful visual glitches. Right now it does not looks like well-polished system of good quality.