modular_aphelion/modules/character_preview/code/rebuilds.dm 
| CHARACTER_PREVIEW_OVERRUN_BUDGET | Of each second, how many ms rebuilds that don't fit in what is left of their tick may take, running it over. |
|---|---|
| CHARACTER_PREVIEW_OVERRUN_BURST | How many ms of such rebuilds may build up for a burst. |
| CHARACTER_PREVIEW_REBUILD_OVERDUE | The longest the queue goes without a rebuild. Once it has, its oldest is rebuilt whether the tick has room or not, so a busy server still rebuilds previews, a little late, and runs a tick over for them at most this often. |
| /var/SScharacter_preview | Starts character preview drawings, and rebuilds preview mobs in turn when many change at once. |
Define Details
CHARACTER_PREVIEW_OVERRUN_BUDGET 
Of each second, how many ms rebuilds that don't fit in what is left of their tick may take, running it over.
CHARACTER_PREVIEW_OVERRUN_BURST 
How many ms of such rebuilds may build up for a burst.
CHARACTER_PREVIEW_REBUILD_OVERDUE 
The longest the queue goes without a rebuild. Once it has, its oldest is rebuilt whether the tick has room or not, so a busy server still rebuilds previews, a little late, and runs a tick over for them at most this often.