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An adapter should not affect the performance, if it is designed and constructed properly.  And you just cannot tell from the outside.  So, one cannot be 100% sure until one actually uses the adapter.

Personally, I would prefer to use a cable that already has an right-angled end rather than to use an right-angled adapter connected to another straight cable.  One fewer component and one fewer connection mean smaller chance to go wrong.  Simplicity is beautiful.