Startup is small (roughly 45 KB), so it's difficult to trim much from it. If you use the QNX Instant Device Activation technology, your minidrivers are linked to the startup program and consequently add to its load time. Ensure that your minidrivers are as small as possible—don't add too many unused debug or kprintf() calls.
For more information about minidrivers, see the Instant Device Activation User's Guide.