Change default max_concurrent_files to 512

[djaglowski]

Description of Changes

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.3793215	-0.17242444	129.41339	+2.772766
1	5000	4.3103623	-0.48279476	136.34657	+2.9057007
1	10000	9.913996	+0.20705509	145.1056	+4.483032
1	50000	49.499508	+2.360962	178.32759	+5.888748
1	100000	92.45093	+0.82910156	230.07193	-9.212555
10	100	1.8793254	+0.15511215	132.0718	-2.4773712
10	500	5.6036005	-0.18963814	138.6149	-2.0849915
10	1000	11.0000725	-1.5862617	146.7772	+0.4096222
10	5000	49.638767	-3.4152374	177.1339	-0.6011505
10	10000	101.45197	-2.5137558	233.74892	+13.088364