Increasing the variant counts and adding 3D (.glb) files for variants

Hi There,

Looking for help on how can I add 3D (.glb) files for my product variants and also how to increase the variant counts from 100 to more. Also, there is one more question that I am finding an answer for is, adding multiple .glb files might lead to site speed issues due to the heavy data usage. In that case how can I use one .glb file for a product where I can place out multiple variants.

P.S. I know there are shopify paid apps available to deal with this but I am looking for a more cost effective solution.

Any help welcome

Regards,

Deepak