Zend certified PHP/Magento developer

magento 2 checkout slow loading after all optimization done

The checkout page on our Magento 2 store is loading insanely slow. Does anyone know what causes this or how to fix this?

I provided a screenshot of the chrome waterfall. As you can see, some files are queued taking more time to load
enter image description here

How can we speed this up? I checked the TTFB by enabling profiling, but that didn’t show any significantly slow things. Please check screenshot.

i have done js and css merging and advance bundling done. cdn, cache enabling varnish and redish also configured stil it is slow
m1 is loading with 200 items load time – 7- 8
m2 is loading with 200 items load times – 30 -35
any solution sujections pls to match m2 chekcout to m1