[johnwayneb]

Defraging the disk will have no impact, and regardless should not be a solution to poor application performance.

I tested this on both a fresh install with 0 books and one with only a dozen or so. Same results. I am not alone in reporting this issue, so maybe you should realize that its a problem and stop trying to solve/diagnose peoples hardware issues as it is clearly a software one.

The main issue with UI unresponsiveness is clearly with rendering of the svg files. For those who fail to understand, what I did was remove the resources/images folder that contains all the toolbar icons, etc.. used by the app. The app started without any visible icons, and ran MUCH faster.

Why this is fast for you i do not know, maybe you have a better video card? I dont really care. The bottom line is why would one choose to use CPU intensive vector graphics for the rendering of any application icons? Its makes no sense.

When attempting to load the "Toolbars/Context Menus" tab under "Preferences/Interface" the CPU usage of callibre.exe jumps to 95+% and the app stalls. Running the same test without the resources/images folder calibre.exe works at 3%. I ran the same test on Ubuntu with the same results.

The boot up time of the app is also signifigantly, ~1sec, faster with icons disabled.

I've tested it also an a Windows 7 machine with only a single CPU and the performane issues remain identical.

It is unclear to me what benefits I recieve from having an app launch (at minimum) 3 processes on a single core cpu. I'm all for multi-threading, but this technique to me seems like overkill.