Hi team,
For the performance monitoring we used performance timer,Trace parser, Aplication insight, Telematory tools in D365FO
In which sequence we should go … I mean which one come first, then next one so on…
Pls advise, thanks

Hi team,
For the performance monitoring we used performance timer,Trace parser, Aplication insight, Telematory tools in D365FO
In which sequence we should go … I mean which one come first, then next one so on…
Pls advise, thanks
@CU10121822-0
The correct sequence is Application Insights → Performance Timer → Trace Parser. Always work from macro to micro — environment level first, then session level, then code level. Reversing this wastes hours debugging X++ when the real issue is a database lock.
Phase 1 — Application Insights and Telemetry — start here
When a user reports the system is slow — do not touch the UI or code yet. Query Application Insights or LCS Environment Monitoring. Look for SQL DTU spikes, blocking queries, deadlocks, and long-running batch threads. This tells you where and when the problem is happening — systemic database issue or isolated process.
Phase 2 — Performance Timer — once you have isolated the slow process
Append &debug=develop to your D365 URL. Reproduce the exact slow steps. The timer splits execution time between Client, Network, and Server. If Client time is high — the issue is UI rendering. If Server time is high — the issue is X++ or SQL. This tells you who is to blame before you open a single line of code.
Phase 3 — Trace Parser — only after Performance Timer confirms Server is the bottleneck
Capture an ETL trace using Settings > Trace while executing the slow process. Open in the Trace Parser desktop utility. Sort by Inclusive/Exclusive time in the Call Tree. Trace Parser pinpoints the exact X++ method causing the delay, highlights inefficient database roundtrips like while select loops without set-based operations, and exposes missing indexes.
Skip Phase 1 and you risk spending days optimizing code that was never the problem.
If it helps, mark as answered