Poor Large input first query performance
### Summary

We are refactoring from V4.
When we use large inputs, we are observing poor pefrormance for first query. 
### Steps to reproduce

Follow steps in readme https://github.com/Huararanga/postgraphile-large-input

### Expected results

Good pefrormance on first query call

### Actual results

Poor pefrormance on first query call

### Additional context
