What's your experience with the 'no calibration' deep sleep mode?

Electronics
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What’s your experience with the ‘no calibration’ deep sleep mode? The ESP documentation claims that it dramatically lowers power consumption on wakeup.

I am particularly interested in the impact it has on Wifi performance. I could not find any documentation on that.

I did find an interesting piece of information, however. With the default sleep mode, the calibration frequency is controlled by a setting stored in the flash. The value x of byte 108 in esp_init_data_default.bin indicates that every x-th wakeup should be performed with RF calibration. For my 2MB module, that section of flash starts at 0x1fc000 (+ 108 bytes for the value of interest).
http://www.espressif.com/sites/default/files/9b-esp8266-low_power_solutions_en_0.pdf

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Found some information in the comments here: https://github.com/esp8266/Arduino/blob/master/cores/esp8266/core_esp8266_phy.c#L242

The meaning of the flags themselves is documented elsewhere, but it was not clear to me that the rf calibration data was stored in flash.

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Replying to myself… To partially answer my initial question: not doing rf calibration on every boot should not have a big impact on wifi performance. Vdd voltage seems to be influential according to the sdk documentation - that is a deviation from the link I posted earlier.