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Is AxonASP Faster Than Native IIS ASP? What the Evidence Shows

AxonASP’s documented engine architecture differs from native IIS Classic ASP, but vendor-reported capacity is not a head-to-head benchmark. Here’s how to compare them fairly.
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There is not enough published evidence to say that AxonASP is faster than native IIS Classic ASP. AxonASP documents a Go-based runtime with a single-pass VBScript bytecode compiler and a stack-based virtual machine, while native Classic ASP runs through IIS. Those are meaningful architectural differences, not proof of a performance winner. AxonASP’s project page reports about 2,000 requests per minute on simple pages and about 100 MB of memory use, but those vendor figures are not a controlled comparison with IIS.

What is being compared?

“Native IIS ASP” means Microsoft’s Classic ASP implementation hosted by IIS—not ASP.NET, and not AxonASP placed behind IIS as a reverse proxy. Microsoft describes Classic ASP as “a server-side scripting environment that you can use to create and run dynamic web applications.” Microsoft’s IIS Classic ASP scenario explains that ASP and ISAPI components are added to an IIS installation.

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AxonASP is a separate runtime for Classic ASP. Its IIS deployment option uses IIS as a reverse proxy to an AxonASP HTTP executable; IIS in that arrangement does not turn AxonASP into the native IIS ASP engine.

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How do the engines differ?

AxonASP’s documented execution path

AxonASP’s architecture notes describe a VBScript lexer and parser that emit bytecode in a single pass, followed by execution on a stack-based virtual machine. The notes say this avoids an intermediate abstract syntax tree (AST) stage for VBScript. They describe JScript separately: its execution path is AST-based. The AxonVM package documentation likewise characterizes AxonVM as a single-pass bytecode compiler and stack-based execution engine.

These sources document the project’s design. They do not show that avoiding an AST makes AxonASP faster than IIS for a particular application. Runtime speed also depends on the work performed by the page, its dependencies, configuration, and the request path.

Native IIS Classic ASP

Native Classic ASP is hosted through IIS. IIS can also cache the output of dynamic pages, including Classic ASP pages. When a cached response is served, the script may not run for every request, which can substantially change what a load test measures. Microsoft outlines this behavior in its documentation on IIS dynamic caching and compression.

What do the published performance figures establish?

The AxonASP project page reports approximately 2,000 requests per minute on simple pages and about 100 MB of memory use. These are AxonASP’s vendor-reported figures; the page result does not specify a reproducible workload, hardware, operating system, concurrency, cache state, latency distribution, or measurement protocol, and independent replication is not established here. They should not be treated as a production guarantee or as a comparison with IIS.

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The available material does not provide an independently published, controlled AxonASP-versus-native-IIS Classic ASP benchmark. The ASP.NET scenarios documented by the aspnet/Benchmarks project illustrate that benchmark results depend on scenario and machine profile, but they are not a test of AxonASP against native IIS Classic ASP.

How can you compare performance fairly?

Use the same representative application on both systems, and make the test conditions explicit. A useful comparison measures script execution separately from cached-response delivery rather than allowing one engine to serve cached output while the other executes the page.

  1. Match the application work. Use identical ASP code, response body, database contents, and external dependencies wherever both runtimes support them. Record any compatibility changes instead of silently altering the workload.
  2. Match the machine and network. Keep the physical or virtual host, CPU allocation, memory, operating system where technically possible, and network path equivalent. If the operating system cannot be the same, disclose the difference.
  3. Define cache behavior. Run an uncached test in which requests execute the page, then separately test any configured page or output caching. Document cache settings and warm-up so that cached delivery is not mistaken for faster script execution.
  4. Keep load conditions consistent. Use the same concurrency and test duration. Label cold-start tests separately from tests against warmed persistent processes.
  5. Measure more than throughput. Report requests per second or minute alongside latency percentiles, CPU, memory, errors, and checks that session and application state remain correct.
  6. Make the test repeatable. Publish runtime and version numbers, configuration, workload details, and exact commands. Without those details, readers cannot interpret or reproduce the result.

Test deployment topology as a separate variable: native IIS hosting, AxonASP’s standalone HTTP server, and AxonASP behind an IIS reverse proxy have different request paths and operational behavior.

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What should you check beyond speed?

A faster result on a narrow test does not establish that a runtime can replace another for a legacy application. Check the application’s actual requirements before choosing a deployment:

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  • VBScript and JScript behavior used by the application;
  • COM objects and other component dependencies;
  • database access and external services;
  • session and Application state, including behavior across multiple processes;
  • operating-system requirements, deployment topology, and ongoing support or maintenance.

AxonASP’s IIS support documentation describes reverse-proxy deployment and warns that multiple processes for one application can fragment state. It also says direct native IIS FastCGI integration is not supported in the manual’s documented setup. Because deployment guidance can change, verify the current manual and test state behavior before implementation. The available sources do not establish compatibility parity for every legacy application.

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