php - is this too much load for an ajax scalable app? -

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i have lobby supposed refresh data of signed players. having ajax call repeats every 3 seconds keep lobby-div "live" possible. ajax call fetches json players information. 25 signed people, parsed json this:

{ "0": [     "dummy player.6935",     "dummy player.3476",     "dummy player.8299",     "dummy player.9591",     "dummy player.7282",     "dummy player.4067",     "dummy player.4818",     "dummy player.1396",     "dummy player.4198",     "dummy player.4244",     "dummy player.5060",     "dummy player.3496",     "dummy player.5932",     "dummy player.2524",     "dummy player.6162",     "dummy player.1828",     "dummy player.7738",     "dummy player.9144",     "dummy player.4312",     "dummy player.9270",     "dummy player.5935",     "dummy player.9523",     "dummy player.4090",     "dummy player.6803",     "dummy player.9576" ], "1": [     "6",     "3",     "2",     "7",     "2",     "9",     "4",     "2",     "5",     "6",     "3",     "5",     "2",     "5",     "7",     "2",     "8",     "1",     "2",     "1",     "5",     "2",     "5",     "9",     "1" ], "2": [     "0",     "0",     "0",     "1",     "0",     "1",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "1",     "0",     "0",     "1",     "1",     "0",     "0",     "0",     "0",     "0" ], "3": [     25,     "3",     "7",     "2",     "1",     "5",     "2",     "2",     "1",     "2" ], "4": [     "0",     "0",     "4",     "0",     "0",     "2",     "3",     "1",     "0",     "0",     "0",     "1",     "0",     "4",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0",     "0" ]

}

the json created .php file lays on server.

is load if 25 people have website open @ sametime , having json requested ?

is there way can try out ? if create 25 browser tabs, same if 25 ppl around europe have website loaded ? it's first time doing webdeving, still have no real clue how test it.


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