autodesk model derivative – Very slow load on APS viewer

I have Revit models which are around 600-700 mb. When I view them in ACC, they take less than 10 seconds to fully load and render all geometrical elements on the viewer. But when I view them in my APS application they take around 2 minutes to load. I know that there can be load time differences but 2 minutes is huge next to 10 seconds.

This is my code:

 

const { ModelDerivativeClient,ConversionMethod,View,Type } = require("@aps_sdk/model-derivative");

    const urn = req.body.objectName;
    const svfPayloadFormat = {
        views: [View._2d, View._3d],
        type: Type.Svf2,
        // advanced: { _2dviews: Model2dView.Legacy, generateMasterViews: true, extractorVersion: ExtractorVersion.Next }
      };

    const  JobPayload = {
        input: { urn: urn, compressedUrn: false }, //, rootfileName: '<>'
        output: {
          formats: [svfPayloadFormat],
        }
    };


    try {
        const job2 = await modelDerivativeClient.startJob(req.oauth_token.access_token, JobPayload);
        // console.log(job2.result);
        return job2.result;
    } catch (error) {
        next(error);
    }

• I use Svf2

• Added ?useOPFS=true at the end of my application link

• My viewer version is v7.114.0

  Why there could be this much difference ? Are there improvements that I can make ?