Deno supports User Timing Level 3which is not widely supported yet in other runtimes.

Encapsulates a single performance metric that is part of the performancetimeline. A performance entry can be directly created by making a performancemark or measure (for example by calling the .mark() method) at an explicitpoint in an application.

PerformanceMark is an abstract interface for PerformanceEntry objectswith an entryType of "mark". Entries of this type are created by callingperformance.mark() to add a named DOMHighResTimeStamp (the mark) to theperformance timeline.

Options which are used in conjunction with performance.mark. Check out theMDNperformance.mark()documentation for more details.

PerformanceMeasure is an abstract interface for PerformanceEntry objectswith an entryType of "measure". Entries of this type are created by callingperformance.measure() to add a named DOMHighResTimeStamp (the measure)between two marks to the performance timeline.

Options which are used in conjunction with performance.measure. Check out theMDNperformance.mark()documentation for more details.