Source code profiler for Lazarus
(Win 32 applications

ProLaza is a tool to measure the runtime of programs developped with Lazarus. ProLaza has most of the functionality of ProDelphi.

The principle of source instrumenting, the sophisticated measurement correction algorithm and the granularity of 1 CPU-cycle guarantee an outstanding measurement accuracy. Even very small or multiple nested functions are measured precisely. After profiling with Prolaza you know where the bottle neck is, not where it might be (see profiler types ). To compare the measurement accuracy of ProLaza with any other profiler, a profiler tester is supplied in the download area.

Source instrumenting also ensures that idle times caused by certain Lazarus- or Windows- API-functions (e.g. Sleep, MessageBox, WaitForSingleObject etc.) are automatically excluded from measurement.

The extremly low measurement overhead guarantees even to measure time critical applications.

The user friendly human interface makes the profiling process fast and easy, the sorting viewer enables the user to find the bottlenecks at first glance.

An optional call graph shows who called a procedure and who is called by it. Also how often this happened and what time was consumed when processing this path is displayed. This call graph makes a quick 'following the execution path' possible without searching in the sources.  An extra window shows the critical path.

A video shows how easy it is, to measure the runtime of an application with ProDelphi. With ProLaza measurement it is done the same way.

Show the demo video with English UI now (5 minutes).
Show the demo video with German UI now (4 minutes).

tune your application

There are two versions of ProLaza:

  • Freeware version
  • Professional version
The Freeware versions measure the runtime of up to 20 procedures.

The Professional versions measure the runtime of up to 64000 procedures, additionally measure pure assembler functions / procedures and have some minor important additional functions (like evaluation of minimum/maximum runtimes).


For the professional version e-mail support is provided for the case of problems.

  • 32 or 64 bit AMD or Intel processor (e.g. AMD  Athlon XP, Turion, Athlon 64 X2, Intel Centrino)
  • For mobile processors the Power save mode should be deactivated during the measurement
  • Windows XP, Vista, 7, 8, 10, 11
  • 64 MB additional free memory
  • 32 bit version of Lazarus 1.x and above

Updated: September/8/2023