Your hard drive doesn't dictate render time. That's a job your CPU handles.
Have your past projects been similar to the project you're currently rendering? If not, you're not making a fair comparison. The length of the timeline, applied effects, formats and codecs, etc all affect your render time...
I often use g-drives and never had this kind of problem. Sometimes they seems to be slow to start playback on my fcp sequence if I leave my computer for some time but I don't think that render times could be affected by your hard drive until it has no other read/write issue...
[Maria-Luisa Meredith]"Ok thanks. Do you mean to use an export codec such as H264 or Motion Jpeg then?"
No H264. that's another GOP based codec.
PhotoJPEG, Prores, Uncompressed, DVCPro..what are considered "production codecs" are Intraframe.
Intraframes codec are compressed/decompressed and processed frame by frame.
Normally with the GOP (Group of pictures), to process a single frame you need to decompress/recompress a full GOP (15 frames for HDV/NTSC), this slow any process.
Proress is the best option when working with HDV stuff.