'In general' means, that the tickers are sent to the client and the client (Browser) receives the data. But all single updates are shown together at the end of the scripts instead of flushing each single ticker. The expected result is an update every second of one of the ticker symbols.

Try printing headers using CGI, for example

use CGI qw//;
my $q = CGI->new();
print $q->header(
    -nph => 0,
    'Content-Type' => ' text/event-stream',
    'Cache-Control' => 'no-cache',
    'Connection' => ' keep-alive',
);
print $q->header(
    -nph => 1,
    'Content-Type' => ' text/event-stream',
    'Cache-Control' => 'no-cache',
    'Connection' => ' keep-alive',
);

__END__
Cache-control: no-cache
Connection:  keep-alive
Content-Type:  text/event-stream; charset=ISO-8859-1

HTTP/1.0 200 OK
Server: cmdline
Date: Fri, 04 Sep 2015 23:33:29 GMT
Cache-control: no-cache
Connection:  keep-alive
Content-Type:  text/event-stream; charset=ISO-8859-1
[download]

Do you see the difference? Without nph off, apache is going to fill in the missing headers

With nph on, apache is not touching the headers .... and probably not buffering

Were you able to get this resolved?