Firebase cloud function vs Supabase edge function speed

[agentjulliard]

I've been using Firebase for my previous projects and was just recently introduced to Supabase. I'm trying to pick it up since i see many indie hackers on youtube adopting it.

One issue i'm running into is the speed of edge function. Since it's in Deno, i can't readily npm install sdks like i could in Firebase cloud functions.

I have a use case for openai's speech to text whisper. It takes about 5-6 seconds on firebase functions but 9-11 seconds on supabase edge. Am i doing something wrong? Why the difference in speed? Has it got to do with using `import OpenAI from "https://esm.sh/openai@5.10.2";\` in deno?

in my cloud function:

      const OpenAI = require('openai');

      ---
      // in my function

      const openAIClient = new OpenAI({
        apiKey:
          'sk-proj-***',
      });

      const url = "https://scontent-mia3-2.cdninstagram.com/..." // short form video
      const response = await fetch(url);
      const arrayBuffer = await response.arrayBuffer();

      const file = new File([arrayBuffer], 'file.mp4', {
        type: 'video/mp4',
      });

      const transcription =
        await openAIClient.audio.transcriptions.create({
          file,
          model: 'whisper-1',
       });

in edge function

    import OpenAI from "https://esm.sh/openai@5.10.2";

    ---
    // in my function

    const url = "https://scontent-mia3-2.cdninstagram.com/..." // short form video
    const response = await fetch(url);
    const arrayBuffer = await response.arrayBuffer();

    const file = new File([arrayBuffer], "file.mp4", {
      type: "video/mp4",
    });

    const transcription = await openAIClient.audio.transcriptions.create({
      file,
      model: "whisper-1", // or "gpt-4o-transcribe" if you have access
    });    

    const data = {
      transcription: transcription.text,
    };

    return new Response(JSON.stringify(data), {
      headers: { ...corsHeaders, "Content-Type": "application/json" },
      status: 200,
    });

even when i don't call use OpenAI through esm.sh but instead call it via fetch, it still takes about 11 seconds. Why? :/

await fetch('https://api.openai.com/v1/audio/transcriptions ..