I installed VirusBarrier X5 about 2 months ago on a Dual G5 2.0 running 10.4.11 with 5GB of RAM. I shoot a lot of pictures and I have used a very speedy SanDisk Extreme USB 2.0 CF reader for 2 years that had transfer rates of up to 20mb/sec. However for the past few weeks it had become extremely slow (0.2mb/sec) and "froze" for extended periods of time. Today I disabled the "Real Time Scanner" and immediately my transfer speeds returned to normal. This is an obvious problem that needs to be resolved by the Intego folks.