API Reference > bentleyjs-core > Logging > PerfLogger PerfLogger Class Simple performance diagnostics utility. It measures the time from construction to disposal. On disposal it logs the routine name along with the duration in milliseconds. It also logs the routine name at construction time so that nested calls can be disambiguated. The timings are logged using the log category Performance and log severity LogLevel.INFO. Enable those, if you want to capture timings. Implements IDisposable Methods Name Description constructor(operation: string, metaData?: GetMetaDataFunction): PerfLogger dispose(): void Disposes of any resources owned by this object. Defined in core/bentley/src/Logger.ts Line 361 Last Updated: 12 June, 2024