First off: thanks for replying so quickly. I am a bit further now in my analysis of what's going wrong. I've found that Enterprise Guide isn't the culprit here. It's the whole environment. I've run a couple of SAS programs that are designed to stress the system a little and record things like I/O throughput and elapsed runtimes, while building very large data sets with between 10 million and 380 million records. The old environment is roughly twice as fast as the new one in both runtimes and throughput in MB/s. I'm going to run some additional checks to figure out exactly what is the bottleneck. Again, thanks for your help. Bram
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