Normal iframe duration 60fps: 430 <-- This is what every number /should/ be. But because of fps differences and time it takes to poll the iframe_active pointer, it's never exactly this amount. Sometimes the iframe pointer changes values to something else and resets back to the value that indicates iframes are active. You can see this effect on some datapoints where the iframe count is split up. I've added the total iframe time in parenthesis for those.

Regular roll data (Control group)

iFrame Time: 441 ms
iFrame Time: 432 ms
iFrame Time: 445 ms
iFrame Time: 428 ms
iFrame Time: 445 ms

iFrame Time: 97 ms
iFrame Time: 340 ms (437 ms)

iFrame Time: 434 ms
iFrame Time: 439 ms

iFrame Time: 32 ms
iFrame Time: 392 ms (424 ms)

Average: ~436 ms

------------

With 0 poise - Midrolls - Getting slashed by some hollows

iFrame Time: 429 ms
iFrame Time: 455 ms
iFrame Time: 438 ms

iFrame Time: 10 ms
iFrame Time: 423 ms (433 ms)

iFrame Time: 344 ms
iFrame Time: 73 ms (417 ms)

iFrame Time: 222 ms
iFrame Time: 214 ms (436 ms)

iFrame Time: 448 ms
iFrame Time: 455 ms

iFrame Time: 10 ms
iFrame Time: 424 ms (434 ms)

iFrame Time: 444 ms
iFrame Time: 446 ms

Average: ~440ms

-----------

With 51 poise - Midrolls - Getting slashed by some hollows

iFrame Time: 445 ms
iFrame Time: 447 ms
iFrame Time: 442 ms
iFrame Time: 424 ms
iFrame Time: 440 ms
iFrame Time: 448 ms

iFrame Time: 98 ms
iFrame Time: 282 ms
iFrame Time: 43 ms (423 ms)

iFrame Time: 441 ms
iFrame Time: 432 ms
iFrame Time: 453 ms
iFrame Time: 446 ms

Average ~440 ms


==========
No poise - Thrust

iFrame Time: 449 ms

iFrame Time: 228 ms
iFrame Time: 195 ms (424 ms)

iFrame Time: 454 ms

iFrame Time: 83 ms
iFrame Time: 351 ms (434 ms)

iFrame Time: 435 ms

iFrame Time: 305 ms
iFrame Time: 127 ms (432 ms)

iFrame Time: 452 ms
iFrame Time: 437 ms

iFrame Time: 195 ms
iFrame Time: 190 ms
iFrame Time: 45 ms (430 ms)

iFrame Time: 248 ms
iFrame Time: 22 ms
iFrame Time: 149 ms (419 ms)

iFrame Time: 435 ms

Average: ~436 ms

-----------------------
50.26 poise - Thrust

iFrame Time: 455 ms

iFrame Time: 365 ms
iFrame Time: 64 ms (429 ms)

iFrame Time: 179 ms
iFrame Time: 246 ms (425 ms)

It was at this point I got really tired of collecting data and waiting for the spear guys to attack, so I stopped since I wasn't seeing any difference.

Average: 426 ms