According to the release notes version 2.5.0 features hardware acceleration (using DirectX), which should speed up the export process. However, it doesn't look like it's working for me.
Originally I used the on-board graphics (Intel, 256MB RAM). I just installed an ASUS GEFORCE GTX 750Ti (2GB RAM, DirectX 11, etc.) but there's absolutely no improvement in exporting videos. The clip (2 min 42 sec) I exported for my test takes about 4 min 30 seconds to render - with or without the dedicated graphics card.
Is there anything I need to configure in VIRB Edit to use hardware acceleration?