Is Event Grid faster than Azure Functions? #2

In the previous post I presented you the result of a basic smoke test using Blob Trigger&n

In the previous post I presented you the result of a basic smoke test using Blob Trigger in Azure Functions and the same functionality in Event Grid. The outcome was not surprising - Event Grid seems to be faster and more reliable way of notifying other services about new blobs. What if we perform a stress test? Is anything going to change? Let's check this!


For the current episode I used following producer:

private static void Main()


private static async Task MainAsync()
	while (true)
		var storageAccount = CloudStorageAccount.Parse("");
		var blobClient = storageAccount.CreateCloudBlobClient();
		var container = blobClient.GetContainerReference("functionsgrid");
		var blockBlob = container.GetBlockBlobReference(Guid.NewGuid().ToString());

		blockBlob.UploadText(JsonConvert.SerializeObject(new Blob()));
		Console.WriteLine($"[{DateTime.Now}] Blob uploaded!");

		await Task.Delay(10);

public class Blob
	public Blob()
		Id = Guid.NewGuid();
		Created = DateTime.Now;

	public Guid Id { get; set; }

	public DateTime Created { get; set; }

	public string Text { get; set; }

What is more I run 5 producers at the very same time. 


Here are the results:

How to interpret this chart? On the y-axis we have total execution time(in miliseconds). You can clearly see the difference between Functions and Event Grid(in fact the maximum execution time for Function was greater than 30 minutes!). What is more, the median for Function lies between 50 and 100 seconds.


It seems that there's a clear improvement when it comes to processing times when switching from Azure Functions to Event Grid. You may ask why one would like to use Azure Functions when the difference in processing time is so obvious? As always - you have to ask yourself what are your requirements and what are the current recommendations. The rule of a thumb would be, that if I need predictable delivery time, I'd go for Event Grid. If I don't mind whether a function is called after 1 second or 1 minute, Azure Function is still a viable option.

Add comment