--- title: Optimizing calls to Azure storage using Fiddler | daily.dev description: A NuGet-hosting service called MyGet saw traffic double overnight after being featured at a conference and chosen to host ASP.NET vNext preview packages. To... canonical: https://daily.dev/posts/optimizing-calls-to-azure-storage-using-fiddler-l5awjsvjw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Optimizing calls to Azure storage using Fiddler | daily.dev og:description: A NuGet-hosting service called MyGet saw traffic double overnight after being featured at a conference and chosen to host ASP.NET vNext preview packages. To... og:url: https://daily.dev/posts/optimizing-calls-to-azure-storage-using-fiddler-l5awjsvjw og:image: https://api.daily.dev/og/posts/l5AwJSVJw.png og:image:alt: Optimizing calls to Azure storage using Fiddler og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Optimizing calls to Azure storage using Fiddler **[Maarten Balliauw](https://daily.dev/sources/maartenballiauw)** · 4 min read · 0 upvotes · 0 comments ## Summary A NuGet-hosting service called MyGet saw traffic double overnight after being featured at a conference and chosen to host ASP.NET vNext preview packages. To cope, the team used Fiddler as a proxy (via the Azure storage emulator's DevelopmentStorageProxyUri setting) to inspect calls to Azure table and blob storage, uncovering excessive requests per page (7+ calls, ~210ms) and slow RowKey-only filters causing ~2 second roundtrips. Restructuring queries to filter on PartitionKey/RowKey combinations and adding caching drastically cut response times and server costs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How can I inspect the HTTP requests my application sends to Azure table or blob storage? Point your storage connection string at Fiddler as a proxy using the development storage emulator, with the connection string 'UseDevelopmentStorage=true;DevelopmentStorageProxyUri=http://ipv4.fiddler'. This routes all blob, table, and queue storage requests through Fiddler, letting you inspect URL, result, and timing for each call made during a specific page load or action. _daily.dev surfaces practical debugging tricks like this for developers tuning storage-heavy applications._ ### Why is my Azure table storage query filtering only on RowKey so slow? Filtering only by RowKey forces a full partition scan instead of a direct lookup, which caused roundtrips of roughly two seconds in one production case. Restructuring the query to filter by PartitionKey, or a combination of PartitionKey and RowKey, avoids the scan and brings response times back down to typical sub-100ms levels. _Developers tuning table storage schemas can track these query patterns on daily.dev._ ## Similar posts on daily.dev - [Unlocking True Vertical Scalability in .NET: Slashing API Latency from 10s to 3s on Azure AKS](https://daily.dev/posts/unlocking-true-vertical-scalability-in-net-slashing-api-latency-from-10s-to-3s-on-azure-aks-xvwrgh4t1) · Medium · 7 upvotes · 0 comments - [Why ASP.NET Core Feels Fast Locally but Slow in Production](https://daily.dev/posts/why-asp-net-core-feels-fast-locally-but-slow-in-production-mtgpu8lqk) · C\# Corner · 42 upvotes · 0 comments - [Faster blob copying in Azure Blob Storage](https://daily.dev/posts/faster-blob-copying-in-azure-blob-storage-iv8ss6p2m) · Mark Heath · 0 upvotes · 0 comments - [Today I will… find hidden latency across a distributed .NET application](https://daily.dev/posts/today-i-will-find-hidden-latency-across-a-distributed-net-application-37hqr8by1) · Visual Studio Blog · 8 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#azure](https://daily.dev/tags/azure), [#nuget](https://daily.dev/tags/nuget) [View this post on daily.dev](https://daily.dev/posts/optimizing-calls-to-azure-storage-using-fiddler-l5awjsvjw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Optimizing calls to Azure storage using Fiddler","url":"https://daily.dev/posts/optimizing-calls-to-azure-storage-using-fiddler-l5awjsvjw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/optimizing-calls-to-azure-storage-using-fiddler-l5awjsvjw"},"datePublished":"2026-10-04T13:04:06.943Z","dateModified":"2026-10-04T13:05:04.204Z","description":"A NuGet-hosting service called MyGet saw traffic double overnight after being featured at a conference and chosen to host ASP.NET vNext preview packages. 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