Port "SStechtree startup optimisation" #343
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# About the pull request Optimises the initialisation time of the 'Tech Tree' subsystem. Currently, `/datum/controller/subsystem/techtree/Initialize()` is changing the turf of every tile on the tech tree's z-level to `/turf/closed/void`, presumably so that it all appears black rather than space-y. However since it's calling `ChangeTurf()` on the *entire* z-level (300x226, or 67,800 turfs), this is pretty performance intensive. This PR fixes that by just... not changing the turfs, instead only adding a few `/turf/closed/void`s around the edge of the tech tree area so that it still looks the same in-game. This changes the subsystem's init time from 6.4 seconds(ish), to 0.15 seconds(ish). **Before:**  **After:**  Players viewing the tech tree through the console won't notice anything different, as the remaining layer of `/turf/closed/void`s block their view of the rest of the z-level. # Explain why it's good for the game About 6 seconds knocked off of the server's init time. (10%!) *(At least on my end)* # Testing Photographs and Procedure <details> <summary>Screenshots & Videos</summary> <hr> ### Before/after init times from a few different tests: **Before:**    **After:**    <hr> ### Teleporting to it as an observer, there *is* a visible difference: **Before:**  **After:**  <hr> ### But viewing it IC, it all works exactly the same as before: https://github.com/cmss13-devs/cmss13/assets/57483089/14fc7b05-5279-489f-99df-e9acc83b1420 <hr> ### The new `/turf/closed/void` tiles highlighted for reference:  </details> # Changelog :cl: code: Made the Tech Tree subsystem initialise faster. /:cl:
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About the pull request
Ports this commit:
cmss13-devs/cmss13#5218
Optimises the initialisation time of the 'Tech Tree' subsystem.
Before:
After:
Explain why it's good for the game
Faster init.
Testing Photographs and Procedure
Screenshots & Videos
Put screenshots and videos here with an empty line between the screenshots and the
<details>tags.Changelog
🆑
code: Made the Tech Tree subsystem initialise faster.
/:cl: