Lag

Lag is any frame where the CPU of the console simply can't keep up with the workload it is provided. When this happens, the game halts new calculations, creating a lag frame.

TAS analysis

This table represents an analysis of lag sources throughout the 100% TAS:

Source	Text line	Textbox	UW->OW	OW->UW	OW transition	Supertile	Spiral stairs	Pit/Telepad	Item load	Boss explosion*	UW Mirror	OW mirror	Flute
	3	25	100	120	34	19	57	60	4	125	98	76	67
	3	23	102	122	35	18	61	90	4	46	98	79	69
	3	24	97	116	33	18	57	47	4	54	101	77	69
	3	30	122	82**	34	18	58	61	4	46	99	82	68
	5	32	119	128	32	18	57	55	4	50	99	90	F
	1	24	121	135	35	18	61	P	4	39	UWM	77	F
	4	26	120	117	51	18	67	P	4	223	UWM	78	F
	3	21	99	121	30	19	59	P	4	32	UWM	79	F
	3	19	99	121	35	21	Spiral stairs	P	4	50	UWM	83	F
	3	36	123	94	35	18	Spiral stairs	P	4	148	UWM	83	F

Notes

* Some include ~8 frames for obtaining heart

** Pit transition to underworld

Other notes

• Dark room transitions add about 40f of lag
• TT lag room was 24f of lag
• Boss order: Helmasaur, Blind, Moldorm, Mothula, Vitreous, Trinexx heads, Trinexx shell, Trinexx body, Trinexx head, Lanmo (all 3)

External links

• Lag & Blanking by Retro Game Mechanics Explained