WebAssembly runtime performance article

[danroth27]

[EDIT by guardrex to add the metadata]

Edge has an Enhanced Security Mode feature that will run WebAssembly using an interpreter, which can negatively impact runtime performance. Developers that observe or see user reports of performance issues should consider adding an exception to opt-out of enhanced security mode for the site

I'm not sure where best to document this for Blazor users. Maybe somewhere in the Performance section? @guardrex Any suggestions?

UPDATE: Shifting to include ...

Instead of sticking this content about Edge Enhanced Security Mode here, how about we instead create a new article under the Performance node that specifically addresses WebAssembly runtime performance concerns? This article could cover the default JITerpriter based runtime vs AOT, the various AOT related performance options, like SIMD and exception handling support. This article would also link to the two new WebAssembly perf diagnostics articles for guidance on how to troubleshoot performance issues, making those articles potentially more discoverable.

SIMD coverage is currently here ...

https://learn.microsoft.com/en-us/aspnet/core/blazor/webassembly-build-tools-and-aot?view=aspnetcore-9.0#single-instruction-multiple-data-simd

[guardrex]

It feels like a security subject. I can add a section to the Security and Identity node overview and cross-link it in the Performance overview. Would that be ok?

Will be for the Perf arricle.

For the Performance overview, the section can just about match what's published in the feature coverage ...

The WebAssembly (WASM) interpreter running in enhanced security mode might not yield the same performance when Blazor is running without enhanced security in Microsoft Edge. We recommend adding the site as an [exception](https://learn.microsoft.com/DeployEdge/microsoft-edge-security-browse-safer#enhanced-security-sites) to opt-out of enhanced security mode for site users.

Cross-link the external exception guidance.

[guardrex]

NOTE TO SELF 🦖

Additional cross-ref: https://support.microsoft.com/en-us/microsoft-edge/enhance-your-security-on-the-web-with-microsoft-edge-b8199f13-b21b-4a08-a806-daed31a1929d

[danroth27]

I'm guessing some uses might get confused about the Edge WASM interpreter vs the .NET WebAssembly interpreter-based runtime, so maybe we should avoid specifically mentioning the WASM interpreter and just say the Edge Enhanced Security Model may negatively impacts the performance of WebAssembly based apps.

[danroth27]

It feels like a security subject.

Well, I'd also like to avoid giving users the impression that running WebAssembly is somehow a security risk. Enhanced Security Mode is a very conservative browser setting. I'd prefer to position this as a performance concern.

[guardrex]

Makes sense to me now.

position this as a performance concern

👍

performance of WebAssembly based apps

... including BWA Interactive WebAssembly render mode ... and Auto after shifting to the client.