Networking process (0x124118190) took 4.373567 seconds to launch

[roygroothulze]

Describe the bug
I am exporting a PDF from HTML containing base encoded 64 images. Then doing so it takes a lot longer to export the document and I see the error "Networking process (0x124118190) took 4.373567 seconds to launch" multiple times in the console.

To Reproduce
I use the following HTML:

"""
<img 
 style="object-fit: cover; width: 250px; height: 190px; margin: 0 16px 16px 0"
 src="data:image/png;base64,\(base64String)" width="300" 
/>
"""

An run the following code to export it:

@MainActor
    public func createPDF(
        fileName: String,
        html: String
    ) async throws -> URL {
        print("LOG: Start PDFRepository.createPDF")
        @Dependency(\.pdf) var pdf

        defer {
            print("LOG: End PDFRepository.createPDF")
        }

        let fileURL = FileManager.default
            .urls(for: .documentDirectory, in: .userDomainMask)[0]
            .appendingPathComponent("\(fileName).pdf")

        return try await withDependencies {
            $0.pdf.render.configuration.paperSize = .a4
            $0.pdf.render.configuration.paginationMode = .paginated
            $0.pdf.render.configuration.concurrency = .automatic
            $0.logger = .testValue
        } operation: {
            return try await pdf.render(html: html, to: fileURL)
        }
    }

Expected behavior
The PDF to be exported quicker.

Actual behavior
It takes a lot of time for the PDF to export. The more images I add the longer it takes.
The goal here is to export images that are selected earlier by the user.

Environment:

• OS: iPadOS 16.1
• Xcode version: 16.0
• Swift version: 6.2
• swift-html-to-pdf version: 1.0.3
• Platform: iPad

Additional context
Add any other context about the problem here.

Error messages

GPU process (0x1240c01e0) took 1.811694 seconds to launch
WebContent process (0x12407c100) took 2.687557 seconds to launch
WebContent process (0x12407c640) took 4.369454 seconds to launch
WebContent process (0x12407cb80) took 4.352551 seconds to launch
Networking process (0x124118190) took 4.373567 seconds to launch

[coenttb]

Hi Roy, thanks for reporting this. I’m a bit short on time at the moment, but it would really help if you could:

1. fork the project;
2. add a minimal test case that reproduces the issue

With that in place I can look into it much more quickly. Thanks again for taking the time to submit this!

[roygroothulze]

Hi Coen, thank you for your reply. Will try to make the test case as soon as possible.

Just want to let you know that I found out that this is only an issue when building the app from Xcode. I now have archived it and deployed it to my iPad using TestFlight and it works really fast.

[coenttb]

Happy to hear it's fast where we want it to. Would still be interesting to see if we can squash this performance issue on Xcode. Seems like it has to do with the simulator.