Command 0x03a: Set number of dummy line period (7 bits)
  Range = 0..127
  POR = 22

Command 0x03b: Set Gate (TGate) Line Width (4 bits)
  bits	TGate	Hz	m (0x3a:22)
  0000	30
  0001	34
  0010	38
  0011	38
  0100	44
  0101	46
  0110	52
  0111	56
  1000	62	50Hz	20ms	[POR]
  1001	68		
  1010	78		25ms

Command 0x0b:	Set Delay of gate and source non overlap period
  0010	4
  ...
  0101	10	[POR]
  ...
  1110	28
--> no influence on update time

Formula:
update_time = total_TS_ticks * 20ms + 10ms


Ticks		Measured Speed	Measured Speed	Calclated	Calculated
		0x3a:26		0x3a:22
		[Milliseconds]			ticks*20+10	
137		2808				2750
97		1992				1950
92		1888
87		1788		1767		1750
72		1482		1463		1450
0		11
1		31
2		51		51
10		215		212		210
20				415


update/refresh duration:

(refresh_lines + dummy_lines*2)*TGate*TS_Sum/f_OSC

f_OSC=1MHz (according to the datasheets)
refreh_lines = 296 (for the waveshare display, 0x045 cmd)
dummy_lines = 22 (for the upcoming u8g2 code, 0x03a cmd)
TGate = 62 (POR default, 0x03b cmd)
TS_Sum: Sum of all TS entries of the second part of the LUT
f_OSC: 1MHz according to the datasheet.
so we have

total_refresh_time = 21080*TS_Sum/1000000 = 21ms * TS_Sum

--> this is more or less close to the measure values.



Ticks=61

history clk	clock on	clock off	Time
on		no		no		1228
on		yes		no		1238
off		yes		yes		1382	
on		yes		yes		1320

--> clock enable may take up to 150ms in this example 
clock enable (clock was off before) --> 150ms
clock enable (clock was on before) --> 10ms