I am curious to know if any research has been conducted regarding the
efficiency of having a single (large) .js file downloaded for a
webpage compared to several smaller .js files.
For example in my web pages I often include the scripting code
<script language="javas cript" type="text/javascript"
src="ascript.js "></script>
which contains all the code for a given function, i.e. the main
function and any subsidiary functions.
I have developed a few library functions (leftString, rightString,
etc.) and these can be invoked by functions in other .js files, so I
would have something like
<script language="javas cript" ... src="libs.js"></script>
<script language="javas cript" ... src="ascript.js "></script>
I'm just wondering if there is any difference in download time when
the HTML has to download these separate .js files rather than a single
one.
Even though the use of broadband is spreading I still like to keep my
web pages as efficient as possible, not everyone has broadband after
all, some still use dial-up connections.
Does anybody know?
3  1445 
Gargoyle <no****@loadsar ubbish.perswrot e:
I'm just wondering if there is any difference in download time when
the HTML has to download these separate .js files rather than a single
one.
Even though the use of broadband is spreading I still like to keep my
web pages as efficient as possible, not everyone has broadband after
all, some still use dial-up connections.
Does anybody know?
If you have a lot of small js files then each one will require a separate
request. On a slow link the overhead associated with each request may
become significant.
On the other hand, if you need to change one of your js files then any
browser which has your page in cache will be able to serve up the
unmodified scripts from cache and only the edited one needs to be
downloaded. So if you have a file or files which change frequently load it
separately.
Also, imagine page A requires files W, X and Y and page B needs X, Y and Z:
If you combine each page's javascript then A gets WXY and B gets XYZ which
would be two separate large javascript files. Or you could combine all
possible Javascript for your site and the first page gets the even larger
WXYZ but the second page hit gets it from cache. That way the people who
hit only one page on your site lose out, but if they hit both pages they
gain. Or you could combine XY and keep W and Z separate but then you have a
maintenance headache constantly tuning your site every time a page's
requirements change.
In other words there is no simple answer. Use a tool such as Firebug or
Fiddler to see what your pages are actually doing.
On 9 Jul 2007 12:42:38 GMT, Duncan Booth
<du**********@i nvalid.invalidw rote:
>Gargoyle <no****@loadsar ubbish.perswrot e:
>I'm just wondering if there is any difference in download time when
the HTML has to download these separate .js files rather than a single
one.
Even though the use of broadband is spreading I still like to keep my
web pages as efficient as possible, not everyone has broadband after
all, some still use dial-up connections.
Does anybody know?
If you have a lot of small js files then each one will require a separate
request. On a slow link the overhead associated with each request may
become significant.
On the other hand, if you need to change one of your js files then any
browser which has your page in cache will be able to serve up the
unmodified scripts from cache and only the edited one needs to be
downloaded. So if you have a file or files which change frequently load it
separately.
Also, imagine page A requires files W, X and Y and page B needs X, Y and Z:
If you combine each page's javascript then A gets WXY and B gets XYZ which
would be two separate large javascript files. Or you could combine all
possible Javascript for your site and the first page gets the even larger
WXYZ but the second page hit gets it from cache. That way the people who
hit only one page on your site lose out, but if they hit both pages they
gain. Or you could combine XY and keep W and Z separate but then you have a
maintenance headache constantly tuning your site every time a page's
requirements change.
In other words there is no simple answer. Use a tool such as Firebug or
Fiddler to see what your pages are actually doing.
Thanks for the info Duncan.
In the meantime I've done a few crude tests downloading a page with
three scripts over a DUN connection. I thought one of my script files
was fairly large and yet it only took 2 seconds to download. I guess 2
seconds is reasonable. With a bit of tinkering I could probably get it
down to 1 second.
Gargoyle wrote:
On 9 Jul 2007 12:42:38 GMT, Duncan Booth
<du**********@i nvalid.invalidw rote:
>Gargoyle <no****@loadsar ubbish.perswrot e:
>>I'm just wondering if there is any difference in download time when
the HTML has to download these separate .js files rather than a single
one.
Even though the use of broadband is spreading I still like to keep my
web pages as efficient as possible, not everyone has broadband after
all, some still use dial-up connections.
Does anybody know?
If you have a lot of small js files then each one will require a separate
request. On a slow link the overhead associated with each request may
become significant.
On the other hand, if you need to change one of your js files then any
browser which has your page in cache will be able to serve up the
unmodified scripts from cache and only the edited one needs to be
downloaded. So if you have a file or files which change frequently load it
separately.
Also, imagine page A requires files W, X and Y and page B needs X, Y and Z:
If you combine each page's javascript then A gets WXY and B gets XYZ which
would be two separate large javascript files. Or you could combine all
possible Javascript for your site and the first page gets the even larger
WXYZ but the second page hit gets it from cache. That way the people who
hit only one page on your site lose out, but if they hit both pages they
gain. Or you could combine XY and keep W and Z separate but then you have a
maintenance headache constantly tuning your site every time a page's
requirements change.
In other words there is no simple answer. Use a tool such as Firebug or
Fiddler to see what your pages are actually doing.
Thanks for the info Duncan.
In the meantime I've done a few crude tests downloading a page with
three scripts over a DUN connection. I thought one of my script files
was fairly large and yet it only took 2 seconds to download. I guess 2
seconds is reasonable. With a bit of tinkering I could probably get it
down to 1 second.
Strip out the unnecessary comments, (keep them in a source file
elsewhere) and make EVERYTHING that is used twice, a function....
Size is all that really matters with download speed, above a few hundred
ms anyway. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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