Lazy index

[zklaus]

Description

Update conda-build to use the new conda.core.index.Index.

Xref conda/conda#13880
Xref #5154

Checklist - did you ...

• Add a file to the news directory (using the template) for the next release's release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[codspeed-hq]

CodSpeed Performance Report

Merging #5488 will improve performances by ×26

_{Comparing zklaus:lazy-index (f21952d) with main (6f20ff7)}

Summary

⚡ 1 improvements
✅ 4 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	zklaus:lazy-index	Change
⚡	test_get_build_index	1,633 ms	63.3 ms	×26

[kenodegard]

@zklaus we currently don't have any memray tests hence the memray CI job fails, do we have a test to add here or should we remove the memray CI job?

[beckermr]

@zklaus @kenodegard @jaimergp Do we not have the proper benchmark to see performance improvements from this change? Should we write one?

[kenodegard]

@beckermr I agree adding a benchmark to see the improvement would be great. I'll take a look and see if I can come up with something simple.

[kenodegard]

@beckermr I think #5508 will do the trick, I've tested this locally and saw a 10x speedup, let's see what CodSpeed says once we merge the test into main

[zklaus]

Regarding memray, it would be nice to have a similar reading about possible memory usage improvements. I'll see if I can add something simple to #5508 quickly.

[kenodegard]

@zklaus unfortunately #5508 has already been merged, can we instead work on adding the memray CI workflow and the associated memray test in a separate PR?