Choose a version:
24% The original file has 375329 bytes (366.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89548 bytes (87.4k, 24%).

After GZIP compression these minified files vary in size:
Boot
  35085 bytes (34.3k)
CDN, direct link
cdnhttps
  30602 bytes (29.9k)
CDN, direct link
cdnjs
  30594 bytes (29.9k)
CDN, direct link
gzip -6 (default)
  30483 bytes (29.8k)
local copy
gzip -9
  30447 bytes (29.7k)
local copy
Yandex
  30433 bytes (29.7k)
CDN, direct link
libdeflate -12
  29119 bytes (28.4k)
local copy
7zip -mx=9 -tgzip
  29080 bytes (28.4k)
local copy
kzip -s0 -rn -b0
  29066 bytes (28.4k)
local copy
pigz -11 -n
  29009 bytes (28.3k)
local copy
Zopfli
  28948 bytes (28.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.4.4.min.js

You will automatically get the smallest Dojo 1.4.4 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

Save 1485 bytes by using my Dojo 1.4.4 Zopfli version instead of the best available CDN (5.13% smaller than Yandex, 28948 vs. 30433 bytes):
You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i100000 --mb8 --mls8 --bsr18 --lazy --ohh

(found December 1, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 18  --bsr18
lazy matching in LZ77 yes  --lazy
optimized Huffman headers yes  --ohh
initial random W for iterations 1  --rw1
initial random Z for iterations 2  --rz2

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.4.4/dojo.js --location | md5sum
17b24a8bba68fcf4bdca67cb375ca1a2  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.4.4.min.zopfli.js.gz | md5sum
17b24a8bba68fcf4bdca67cb375ca1a2  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.4.4/dojo.js --location | sha1sum
052a941d526760f7f6140c3aaa8c666aded15510  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.4.4.min.zopfli.js.gz | sha1sum
052a941d526760f7f6140c3aaa8c666aded15510  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 35085 bytes 17b24a8bba68fcf4bdca67cb375ca1a2 March 19, 2015 @ 15:31
cdnjs 30594 bytes 17b24a8bba68fcf4bdca67cb375ca1a2 February 8, 2015 @ 14:45
Yandex 30433 bytes 17b24a8bba68fcf4bdca67cb375ca1a2 June 20, 2013 @ 11:59

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 30602 bytes 5da5660526a3569e9808c3444be2dd8b < /*
< Copyright (c) 2004-2009, The Dojo Foundation All Rights R [...]
< Available via Academic Free License >= 2.1 OR the modifie [...]
< see: http://dojotoolkit.org/license for details
< */
<
< /*
< This is a compiled version of Dojo, built for deployment [...]
< development. To get an editable version, please visit:
<
[...]
December 24, 2015 @ 07:33

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.12.2, 1.12.1,
1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.10, 1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
28948 bytes -3 bytes zopfli --i100000 --mls8 --bsr18 --lazy --ohh December 1, 2015 @ 16:46
28951 bytes -3 bytes zopfli --i10000 --mls512 --bsr18 --lazy --ohh October 21, 2015 @ 13:35
28954 bytes -3 bytes zopfli --i1000 --mls512 --bsr18 --lazy --ohh September 20, 2015 @ 15:28
28957 bytes -6 bytes zopfli --i1000 --mls8 --bsr18 --lazy --ohh September 20, 2015 @ 14:29
28963 bytes zopfli --i100 --mls512 --bsr18 --lazy --ohh September 18, 2015 @ 14:16

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on June 16, 2016 @ 14:38.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000 or 100,000.
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
29001 29003 29005 29006 29005 29008 29022 29022 29008 28979 28975 29009 29022 29012 29012
28980 28996 28999 28986 29002 28975 28964 28993 28995 28983 28984 29015 28995 29014 29020
28988 28989 28990 28983 28974 28998 28975 28981 28982 28984 28979 29019 29000 29012 29015
28988 28982 28993 28990 28974 28984 28982 29012 28983 28976 28977 29017 29020 29013 29013
28984 28979 28985 28980 28984 28986 28978 28978 28974 28975 28982 29009 29012 29013 29010
28986 28980 28976 28970 28982 28993 28975 28970 28979 28989 28989 29009 29009 29014 29012
28982 28987 28989 28987 28969 28965 28973 28974 28978 28990 28988 29010 29018 29014 29010
28992 28979 28975 28981 28974 28974 28969 29013 28980 28979 29012 29010 28998 29014 29006
28978 28966 28975 28967 28967 28988 28983 28974 28979 28974 28984 29010 29007 29017 29010
28978 28972 28971 28973 28973 28972 28971 28975 28989 28976 28988 29010 28994 29013 29007
28979 28981 28982 28971 28965 28974 28966 28977 28964 28979 28984 29011 29000 29012 29013
28975 28967 28972 28978 28967 28969 28974 29013 28979 28979 28951 29011 28998 29012 29013
28981 28971 28966 28988 28976 28973 28973 28969 28987 28988 28988 29010 29005 29012 29012
28967 28977 28960 28967 28980 28975 28976 28974 28988 28988 28973 29009 28982 29013 29012
28983 28980 28948 28958 28968 28970 28974 28969 28948 28988 28988 29012 29010 29017 29012
28986 28991 28977 28975 28965 28983 28975 28971 28966 29008 28995 29010 29001 29012 29013
28955 28952 28955 28952 28980 28980 28974 28981 28968 29008 28973 29010 29004 29015 29009
28989 28967 28970 28981 28970 28970 28975 28976 28982 28986 28980 29011 28992 29019 29013
28978 28963 28980 28974 28986 28989 28974 28981 28983 28984 28991 29012 28995 29015 29011
28980 28979 28980 28972 28968 28971 28975 28974 28969 28983 28990 29016 29003 29014 29007
28977 28968 28967 28982 28987 28975 28970 28977 28989 28986 28990 29009 29000 29012 29012
28970 28973 28964 28992 28989 28973 28974 28973 28979 28976 28975 29010 29009 29012 29011
28976 28975 28977 28975 28971 28978 28979 28972 28986 28980 28991 29013 29013 29010 29010

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:
Iterations Min. Bytes Reduction Coverage
100 28963 bytes 100%
1,000 28954 bytes -9 bytes 100%
10,000 28951 bytes -3 bytes 100%
100,000 28948 bytes -3 bytes 0.87%
1,000,000
10,000,000

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):
Blocks Min. Bytes Compared To Best Zopfli Compared To Best KZIP
29066 bytes +118 bytes (+0.41%)
29067 bytes +119 bytes (+0.41%) +1 byte
29105 bytes +157 bytes (+0.54%) +39 bytes
29075 bytes +127 bytes (+0.44%) +9 bytes
29093 bytes +145 bytes (+0.50%) +27 bytes
29086 bytes +138 bytes (+0.48%) +20 bytes
29079 bytes +131 bytes (+0.45%) +13 bytes
29087 bytes +139 bytes (+0.48%) +21 bytes
29127 bytes +179 bytes (+0.62%) +61 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 23034 bytes -5914 bytes (-20.43%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25807 bytes -3141 bytes (-10.85%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26701 bytes -2247 bytes (-7.76%)
Brotli (Wikipedia) brotli brotli -q 11 26892 bytes -2056 bytes (-7.10%)
LZMA2 (Wikipedia) xz xz -9 27760 bytes -1188 bytes (-4.10%)
ZSTD (Wikipedia) zstd zstd -19 28517 bytes -431 bytes (-1.49%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28631 bytes -317 bytes (-1.10%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):


Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2017.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com