How to query latency with HistoryVerbose 0

We're using Transactional Replication in SQL 2008R2 SP2
I'm trying to evaluate whether using a HistoryVerbose setting of 0 on the Log Reader and Distribution agents is a worthwhile modification to make, but still need to know Latency in these agents at periods of time.
I know it's possible to use Windows Performance Monitor and enable a couple of replication counters but I have reason to want to do this in T-SQL.
Tracer Tokens don't give you the answer until the token has finished replicating - it tells you about the problem AFTER the problem's happened.
It's also possible to get Current Latency from the MSDistribution_History and MSLogReader_History tables, but this information isn't recorded when the HistoryVerbose setting is 0.
It's possible to calculate what the latency is going to be based on the agent's transactions per second and the number of pending transactions, but querying these values can be costly on the Distribution database.
So there may not be an answer to this other than Windows Performance Monitor, but has anyone managed to query Latency in a light-weight query which isn't reliant on the logging in MSDistribution_History and MSLogReader_History?
Thank you if anyone can help!
Tim Johnstone Senior Technical Consultant Computacenter (UK) Ltd

Hi Tim,
Does Replication Monitor meet your requirement? For transactional replication, Replication Monitor displays information about the number of transactions in the distribution database that have not yet been distributed to a Subscriber and the estimated time
for distributing these transactions.
If not, I suggest you looking into below links.
They are related to the tracer tokens technology for monitoring replication latency.
How to: Measure Latency and Validate Connections for Transactional Replication (Replication Transact-SQL Programming)
http://technet.microsoft.com/en-us/library/ms147309(v=sql.105).aspx
SQL Server Transactional Replication Latency Monitoring Tool
http://gallery.technet.microsoft.com/scriptcenter/SQL-Server-Transactional-e34ed1e8
Cheers,
Ying

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