Data ingestion into Supabase is extremely slow

Hello everyone,

I am running a self hosted instance of n8n. I have a worflow which accesses WooCommerce API, then narrows data for import and then is supposed to import data into Supabase. Everything runs just fine for few first lines but then, when Recursive character text splitter nears to at about 1100 counter everything slows down and becomes unsuable.

I have paid Supabase account (PRO), paid OpenAi account (Tier 3 enabled and funded) and funded OpenRouter account. I have tried everything in my power, went to many dead ends using AI and now I am desperately asking fow your help.

What can be the bottleneck, please? What can cause this massive slow down?

If there is anything I cen clear up, please ask. I am desperate…

Thank you very mich in advance.