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Slow webflux multipart upload #34651

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sbxz opened this issue Mar 25, 2025 · 1 comment
Open

Slow webflux multipart upload #34651

sbxz opened this issue Mar 25, 2025 · 1 comment
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@sdeleuze
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in: web Issues in web modules (web, webmvc, webflux, websocket) type: enhancement A general enhancement
Milestone
6.2.x

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@sbxz
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sbxz commented Mar 25, 2025

Hello,

We are developing a document submission application using WebFlux. However, we have noticed that handling multipart requests is slower with WebFlux compared to MVC. For example, when using MultipartFile in MVC, sending a 200MB file takes about 700ms, whereas it takes 4.2s with WebFlux (FilePart) and 4.5s with PartEvent.

Did we miss something?

Here is a repository reproducing the issue: Repo

Spring boot version : 3.4.4
Java 21
@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged or decided on label Mar 25, 2025
@sdeleuze sdeleuze self-assigned this Mar 26, 2025
@sdeleuze sdeleuze added in: web Issues in web modules (web, webmvc, webflux, websocket) type: enhancement A general enhancement and removed status: waiting-for-triage An issue we've not yet triaged or decided on labels Mar 26, 2025
@sdeleuze sdeleuze added this to the 6.2.x milestone Mar 26, 2025
@sdeleuze
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I suspected that when working in this area recently in #34178 and #34388 but was not 100% sure, but your report seems to confirm there is something to improve there, so I will try to have a deeper look.

What I saw was slow upload locally with big files, so I know how to reproduce even if for now, I am not sure about the reason.

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@sdeleuze sdeleuze

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in: web Issues in web modules (web, webmvc, webflux, websocket) type: enhancement A general enhancement
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6.2.x
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@sdeleuze @sbxz @spring-projects-issues