As Clipchamp is using your computer's CPU and memory to process videos and does not process videos online, the speed of your CPU and available memory can have a big impact on conversion performance.
The format, size and resolution of your input video as well as the output settings you pick also play key roles.
Another important factor is the web browser you use. We currently see the best performance in Google Chrome.
Making sure that you're using the latest browser version may also help make the conversion faster. For instance, see here for ways to check if you're using the latest version of Chrome http://www.wikihow.com/Update-Google-Chrome.
One way to make sure Clipchamp works as fast as possible on your computer is to make sure that your CPU is not busy performing other tasks while processing a video, for instance you can close other applications that are running in the background or close other tabs in the browser.
As another measure, you can change the output video resolution and/or quality to a different setting, for instance 720p instead of 1080p - of course only if you're OK with lowering the resolution - which will lead to a faster conversion. Changing the output file size to "Small" or "Smallest" will also speed things up. Please note that there is always a trade-off between conversion times and output video quality though.
All this being said, we are continuously improving the quality of our service by rolling out new versions that bring performance improvements, however are also dependent on latest developments in browser technologies.