This collection of demos highlights common .NET performance and memory problems. All these demos should be rebuilt on the machine where they will be profiled.
This MVC app experiences around a dozen performance and memory issues, which can be identified with ANTS Performance Profiler and ANTS Memory Profiler. There are also a couple of rendering performance issues, which can identified with the Chrome dev tools or with Glimpse.
| Issue | Feature | How to surface |
|---|---|---|
| Slow startup due to multiple sql queries | APP sql profiling APP timeline |
Log in and view any ticket page (eg /TicketCenter) |
| Unnecessary repeated SQL queries due to lazy loading in EF | APP sql profiling | Log in and view any ticket page (eg /TicketCenter) |
| Slow web requests | APP web req profiling APP viewing header information |
Refresh homepage with 1 second (/) |
| Unnecessary web requests due to inefficient API use | APP web req profiling APP call tree filtering APP integrated decompilation |
View Live Support page (/Home/LiveHelp) |
| Misuse of string concatenation | APP line-level timing APP call tree filtering |
Log in and search for 'imported' |
| Leaked dynamic assemblies | AMP loaded assemblies info | Run load against /Home/Status using tinyget .bat file |
| Multiple view engines loaded | Glimpse view tab | View about page |
| No time delay for ajax autocomplete | Glimpse hud ajax count | Create new ticket and type in tag field |
| Slow corner rendering for large search results | Glimpse hud time split Chrome dev tools rendering analysis |
Log in and search for 'imported' |
| Compression not enabled | Page Speed Test | Run against any page |
See Demos/TicketDesk/README.md for more complete instructions.
This WinForms app may be preferable to the TicketDesk MVC site for those working with desktop applications.
| Issue | Feature | How to surface |
|---|---|---|
| Slow startup due to initializing EF | APP call tree filtering APP timeline |
Start the app, select initial CPU spike |
| EF n+1 lazy loading | APP sql profiling APP line-level timings |
Search for members in London with loan filtering ticked |
| Slow loading of user details | APP web request profiling | Select any member in search results |
| Slow searching due to rendering | APP call tree filtering | Search for books called Monster |
| Slow searching due to missing index | APP execution plan view | Advanced search for books called Monster by John |
See /Demos/LibraryManager/README.md for more complete instructions.
Basic introduction to ANTS Performance Profiler, showing the value of line level timings to identify an O(n^2) algorithm.
Show APP's Async code profiling while copying a directory of files asynchronously. There is no performance issue in this application.
A WinForms event handler leak, keeping a form containing database strings in memory.
The same event handler leak as QueryBee, but with no need to connect to a database.
A WinForms event handler leak per QueryBee and Pattern Generator, but which leaks unmanaged images. This can be used to understand how to profile unmanaged memory usage using ANTS Memory Profiler.
Shows ANTS Memory Profiler's unmanaged profiling when an unmanaged pdf generation library doesn't get cleaned up properly because of a blocked finalizer.
A demonstration of AMP's 'loaded assemblies' functionality.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent