Some applications can be particularly sensitive to cold start, which is the amount of time it takes for an application to be initialized and start processing work. The Azure Functions team is constantly making improvements to cold start, and .NET apps using the isolated worker model can now benefit from optimizations available in the latest versions of core dependencies.
To take full advantage of these improvements, projects should be upgraded to the latest versions of core dependencies. Existing function apps may also require changes to a few configuration settings.
For more info: https://learn.microsoft.com/azure/azure-functions/dotnet-isolated-process-guide#performance-optimizations