I have reported performance problems with TDM back to version 4.3.
While there are many improvements in the current Beta over the 4.3 performance is still lagging the original Case Studio product in many areas.
Converting to binary storage format from the XML format appears to have improved basic usage performance.
When generating a script to create tables, views, types, packages, roles, etc. actual measured time for TDM 4.3 to the current Beta lags a full order of magnitude behind Case Studio.
The benchmark I used was a reverse engineering of 5 schema owners and all of their objects as above. Following the reverse engineering I ask each to generate a script to create those objects.
Current TDB Beta time to generate the model: Just over 40 minutes
Case Studio 2.25 time to generate the model: 3 minutes
Case Studio is an older product with support stopping at Oracle 10g. Still, no items were missed in this particular test.