Why Are My Entity Framework Async Operations Slower Than Synchronous Ones?

Entity Framework Async: Unexpected Performance Bottleneck

Migrating to asynchronous controllers and database operations (using ToListAsync() instead of ToList()) often improves application performance. However, this isn't always the case. In a recent scenario, switching to asynchronous methods dramatically slowed down query execution. The following query, retrieving "Album" objects with a simple database join, exemplifies this issue:

<code class="language-csharp">var albums = await this.context.Albums
    .Where(x => x.Artist.ID == artist.ID)
    .ToListAsync();</code>

The generated SQL query is (truncated for brevity):

<code class="language-sql">SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[URL] AS [URL], 
[Extent1].[ASIN] AS [ASIN], 
...</code>

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