We were working on new algorithms to mask your data faster. We have covered the most commonly used rules and will be taking them out of beta in V7. However, you can get early access today to get an immediate speed boost. 

The new algorithm uses more memory within data masker, more tempdb space on the SQL Server and works in larger batches so may have an impact on transaction log size. You are able to control the batch size by changing the 'Commit Frequency' inside the rules; We've changed the default commit frequency from 1000 to 100,000 rows; in our testing, this produces the best performance.

This option is enabled by default for new masking sets, for your current masking sets you can opt-in through the 'V7 enhanced performance' option on the Setup tab. If you encounter any problems please contact support, so we can promptly address them.

We are looking for feedback on the performance of the new algorithm, we have already seen real masking sets run up to 10x faster, most users report a 3x speedup.

The 'Enable version 7 enhanced performance' option

List of rules supported by the option:

• Substitution
• Shuffle
• Row-Internal Synchronization
• Search Replace