UPDATE: Aug 25, 2015
I was using an older revision of the Arduino IDE (old 1.6.4) and an old set of Exp Extensions.
With current IDE 1.6.5 and current Esp Ext's the "server.send()", "server.sendContent()", and "server.client().print()" functions all have about the same performance - fast.
The moral of the story, make sure your environment is up-to-date.
I use, and like, the Arduino IDE for ESP8266 software development and have used the "example code" for my initial efforts, but now, my interest expand beyond trivial examples.
Above is My Experimental Web Server Farm :-) (a little under powered, but it works)
Like many of the published ESP examples, I used a form of "server.send()"
to transfer data via WIFI, but then I found "that" function is somewhat
limited (or at least the way I understand it) and therefore I explored
the available documentation and source code for other capabilities.
I found "server.sendContent()"
which appeared more flexible and more to my desires for a transfer
function. I have used "it" for several months for building my apps. My
typical transfers are about 5K to 15K bytes, but can be as large as 100K
My dynamically created WEB Pages typically take about "6.5 seconds" to transfer to a browser, for a small device like the ESP's, I thought that was a little slow, but still usable.
Actually, for my application, I started considering abandoning the ESP's, due to lack of WIFI transfer speed.
BUT THEN, in some obscure recesses of some online web page, I found the "server.client().print()" function - A BIG SPEED IMPROVEMENT. Now the same dynamic WEB Page transfers in only "0.043 seconds" !!!!
For my application, that is a BIG speed improvement of 160 times faster. From my perspective, the little ESP is now a WIFI "screamer" !!
I really like it, . . . when something WORKS !!
note is published here in hope that someone else finds this information
useful. If previously known, it would have save me a lot of time and
I only wished I understood or knew this earlier, but
then I am still learning the ESP (there is much to know). I am sure
there are other ESP improvements or coding strategies that I have yet to
discover. I plan to publish my "example" application code for others to
review, use, and/or abuse.
For your review, my experimental ESP Web Server is (sometimes) running at:
-- Home Page: https://WA0UWH.blogspot.com