Here are some of the tools that can be used to do web application performance testing;
WebLOAD
LoadNinja
HeadSpin
ReadyAPI Performance
LoadView
PFLB
Keysight’s Eggplant
Apache JMeter
LoadRunner
Rational Performance Tester
NeoLoad
LoadComplete
WAPT
Loadster
k6
Testing Anywhere
Appvance
StormForge
What about Databases?
SQL queries in SSMS runs faster but they are slower in .NET application. One of the reason could be ARTHIABORT setting, read article below;
References