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what version of MDEX are you running...at least 6.2 I guess ?
are all your MDEXes running same version ?
when you upgraded did you also upgrade your API version ?
I'm more interested in hearing about measured performance issues or anecdotal knowledge on how these flags may affect performance of the dgraph.
then i'd suggest running Eneperf against this specific Dgraph and another one without flags (using the same file)
While I can't say with 100% certainty, I seriously doubt these flags have any impact on performance. The backward compatibility flags were built in so that customers could upgrade their version of the MDEX without having to upgrade their API logic on the front end (back two releases maximum). These flags instruct the MDEX to allow some older, possibly depricated, filter syntax to be processed. Therefore, my strong suspicion is that these flags themselves will have no impact on performance itself. The features you're using in the MDEX along with your data volume, data characteristics, and hardware/network will continue to be the main drivers for performance.