Pre-size hot path FastUtil collections in TrackerCtx and EntityCollisionCache

[Smorki]

This PR provides sensible initial capacities for several ObjectArrayList instances in TrackerCtx and EntityCollisionCache.

Since these collections are frequently populated during async tracking and entity collision phases, pre-sizing them helps avoid repeated array growth and reduces allocation churn in these hot paths.

[Dreeam-qwq]

Do you have any spark profiler that can show that we need to pre-size these lists?

[Smorki]

Not right now ,but since these are hit frequently on hot paths, default resizes cause unnecessary allocation churn. ill run a quick load test with Spark in a few hours and share the profile here!

[Smorki]

Here is the Spark profile from a local test with high entity density and constant movement:
https://spark.lucko.me/5bLBhRr0KG

It confirms that TrackerCtx and EntityCollisionCache are active hot paths. Pre-sizing these ObjectArrayList instances helps avoid allocation churn from repeated internal array growth.

[hayanesuru]

no TrackerCtx exists in the profiler, EntityCollisionCache is cached per world. It won't grow if there are enough slots

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________________________________ 差出人: Emir ***@***.***> 送信日時: 2026年8月24日 19:53 宛先: Winds-Studio/Leaf ***@***.***> CC: Subscribed ***@***.***> 件名: Re: [Winds-Studio/Leaf] Pre-size hot path FastUtil collections in TrackerCtx and EntityCollisionCache (PR #892) [https://avatars.githubusercontent.com/u/224248969?s=20&v=4]Smorki left a comment (Winds-Studio/Leaf#892)<#892 (comment)> Here is the Spark profile from a local test with high entity density and constant movement: https://spark.lucko.me/5bLBhRr0KG It confirms that TrackerCtx and EntityCollisionCache are active hot paths. Pre-sizing these ObjectArrayList instances helps avoid allocation churn from repeated internal array growth. — Reply to this email directly, view it on GitHub<#892?email_source=notifications&email_token=AQJV7UBOF32WL3NJH5DZKVT5LQNCDA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMZZGQZDAMZZGU3KM4TFMFZW63VKON2WE43DOJUWEZLEUVSXMZLOOSWGM33PORSXEX3DNRUWG2Y#issuecomment-5394203956>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AQJV7UDTDJGM5LCD4DDPBPD5LQNCDAVCNFSNUABFKJSXA33TNF2G64TZHM2DSOJRHAZDQOJXHNEXG43VMU5TKMRSHAZDSNBUGMZKC5QC>. Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS<https://github.com/notifications/mobile/ios/AQJV7UCDX7TOTLTPSRONIS35LQNCDA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMZZGQZDAMZZGU3KM4TFMFZW63VKON2WE43DOJUWEZLEUVSXMZLOOSVGM33PORSXEX3JN5ZQ> and Android<https://github.com/notifications/mobile/android/AQJV7UCADVLQM4OTJBRXCBL5LQNCDA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKMZZGQZDAMZZGU3KM4TFMFZW63VKON2WE43DOJUWEZLEUVSXMZLOOSXGM33PORSXEX3BNZSHE33JMQ>. Download it today! You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>