As far as I know, no. Not short of examining the current stack which you don't want to do. The idea smells a bit fishy anyway, sounds like you will be too tightly coupled.
I would focus on speeding up the scripted field, or using a read-only custom field that is updated through a listener.
Yeah, tricky one. Maybe a custom field that has a template that uses js to lazily get the value from the web service. Depends if you want to index the returned value or not... also you could do caching on the web service side, but there will still be a lot of requests if you do a full reindex for instance.
Thank you for valid input. I do not index the returned value as I have the basic information ("commit id's") in another Jira field, the web service returns valuable details in html from our non-Atlassian-supported RCS that some users needs for processing while issues are in certain states. I will plan a load test to see how serious the problems is, then we will act from there
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