Thanks @ChrisHemedinger, always useful to get information from the horse's mouth (not that I'm suggesting...)!
There are a few good things to try here, and I definitely have a few objects with ActiveX output so I'll try changing these to PNG. Unfortunately, being still with 7.15, HTML5 and SVG don't appear to be options. We have a freeze on system changes at the moment but when things get back closer to normal we are planning an upgrade to M6, mainly to escape Flash in VA 7.4, but that will also include the latest version of EG, I would imagine. Having briefly skimmed through a "what's new" posting here, I'm quite excited by that.
Interestingly, it's not just output which is the problem. My first step is an import of a CSV, using PROC IMPORT in code from a shared drive. This is also very slow to get going. It sits for a minute or two with the message "preparing the server..." in the Task Status.
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