In TC 8, opening a failed test run's log was fast even if the log was very large. The reason it was fast was because TC 8 only loaded into memory enough of the test run's log to populate the Log Item...
Hi timfox, Although I am not "against" your suggestion, I would say TestComplete should leave handling big data files to specific (better suited tools). Meaning, that I think TC would be much better off supporting writing testresults to SQL database format. And leave opening/handling these SQL db files to specific tools. You can then use specific SQL handling tools for opening these files/databases, like MS SQL Management, HeidiSQL, etc. those tools are dedicated to opening big data files and specialized in handling big data files. In your case that would require the implementation of a pretty simple SQL query on the test results database. SQL queries are fast and flexible.
With that in mind, I think this feature request is an interesting feature request, which you can think of voting for. Microsoft Power BI is a platform you can think of as well. It would allow real time visual representations of your test results.
TestComplete is a testing tool and should focus on supporting the broad range of application frameworks, as well as other things (bug fixes, improvements).