When we can help you

Your ASP.NET website works very slow and website isn't reliable
Your ASP.NET website hangs at all during specific hours/days when traffic is more higher than usual
You scaled up AWS/Azure but it costs too much and you want to optimize bills
Migrate your ASP.NET website to the latest version
Optimize SQL database queries and execution plans
Connect or optimize NoSQL storages like MongoDB, CosmosDB
Connect modern Search engine like Lucene or Elastic to prevent database exhausting in case if it's hard to optimize it quickly
Rewrite monolith ASP.NET app to the service-oriented/microservice architecture
Migrate your ASP.NET website from/to Azure/AWS Cloud

We have expertise in speeding up ASP.NET applications, and here are some basic pieces of advice

Avoid slow SQL operations by using tools like MS SQL Profiler or ELK to identify and address such issues
Prevent deadlocks by utilizing .NET Performance Profiler to detect and resolve such problems
Refrain from mixing synchronous and asynchronous code
Implement server-side caching or distributed caching
Scale up your application using Web Garden
In a live environment, either disable logs or transfer them to a NoSQL storage solution like Elastic or MongoDB
Avoid setting debug="true"
Avoid very old ASP.NET versions
Avoid .NET razor compilations and HTML/Tag helpers espessially in oldest ASP.NET versions
Use CDN where it's possible