Choose a version:
30% The original file has 1605952 bytes (1,568.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 488131 bytes (476.7k, 30%).

After GZIP compression these minified files vary in size:
Boot
  129854 bytes (126.8k)
CDN
cdnjs
  124033 bytes (121.1k)
CDN
gzip -6 (default)
  122517 bytes (119.6k)
local copy
gzip -9
  121996 bytes (119.1k)
local copy
7zip -mx=9 -tgzip
  117851 bytes (115.1k)
local copy
libdeflate -12
  117778 bytes (115.0k)
local copy
pigz -11 -n
  117696 bytes (114.9k)
local copy
kzip -s0 -rn -b3
  117572 bytes (114.8k)
local copy
Zopfli
  117549 bytes (114.8k)
local copy
Zopfli (defluff)
  117544 bytes (114.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.17.2.min.js (or via HTTPS)

You will automatically get the smallest Ember 2.17.2 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 6484 bytes by using my Ember 2.17.2 Zopfli version instead of the best available CDN (5.52% smaller than cdnjs, 117549 vs. 124033 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 --i1000000 --mb8 --mls2 --bsr12 --lazy --ohh

(found February 21, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 2  --mls2
block splitting recursion 12  --bsr12
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 5 more bytes (117544 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v2.17.2/ember.min.js --location | md5sum
74e5e18393d4a788552b2882467d53bd  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.17.2.min.zopfli.js.gz | md5sum
74e5e18393d4a788552b2882467d53bd  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v2.17.2/ember.min.js --location | sha1sum
b9360ea7d8ee1e279131d6c6a5c513f70c362556  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.17.2.min.zopfli.js.gz | sha1sum
b9360ea7d8ee1e279131d6c6a5c513f70c362556  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 129854 bytes 74e5e18393d4a788552b2882467d53bd June 7, 2018 @ 20:21
cdnjs 124033 bytes 74e5e18393d4a788552b2882467d53bd February 15, 2018 @ 01:49

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

Other Versions

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

3.0.0,
2.18.2, 2.18.1, 2.18.0,
2.17.2, 2.17.1, 2.17.0,
2.16.2, 2.16.1, 2.16.0,
2.15.3, 2.15.2, 2.15.1, 2.15.0,
2.14.1, 2.14.0,
2.13.4, 2.13.3, 2.13.2, 2.13.1, 2.13.0,
2.12.2, 2.12.1, 2.12.0,
2.11.3, 2.11.2, 2.11.1, 2.11.0,
2.10.2, 2.10.1, 2.10.0,
2.9.1, 2.9.0,
2.8.3, 2.8.2, 2.8.1, 2.8.0,
2.7.3, 2.7.2, 2.7.1, 2.7.0,
2.6.2, 2.6.1, 2.6.0,
2.5.1, 2.5.0,
2.4.6, 2.4.5, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0,
2.3.1, 2.3.0,
2.2.2, 2.2.1, 2.2.0,
2.1.2, 2.1.1, 2.1.0,
2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.13.13, 1.13.12, 1.13.11, 1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.2, 1.12.1, 1.12.0,
1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.1, 1.10.0,
1.9.1, 1.9.0,
1.8.1, 1.8.0,
1.7.1, 1.7.0,
1.6.1, 1.6.0,
1.5.1, 1.5.0,
1.4.0,
1.3.2, 1.3.1, 1.3.0,
1.2.2, 1.2.1, 1.2.0,
1.0.1, 1.0.0

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

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
117549 bytes -2 bytes zopfli --i1000000 --mls2 --bsr12 --lazy --ohh February 21, 2018 @ 06:32
117551 bytes -3 bytes zopfli --i100000 --mls2 --bsr12 --lazy --ohh February 17, 2018 @ 10:35
117554 bytes -1 byte zopfli --i10000 --mls8 --bsr11 --lazy --ohh February 17, 2018 @ 08:06
117555 bytes -1 byte zopfli --i100000 --mls2048 --bsr25 --lazy --ohh February 17, 2018 @ 02:35
117556 bytes -7 bytes zopfli --i10000 --mls2 --bsr17 --lazy --ohh February 16, 2018 @ 17:54
117563 bytes -3 bytes zopfli --i1000 --mls2 --bsr17 --lazy --ohh February 16, 2018 @ 17:02
117566 bytes -2 bytes zopfli --i1000 --mls4096 --bsr30 --lazy --ohh February 16, 2018 @ 16:44
117568 bytes -16 bytes zopfli --i1000 --mls8 --bsr21 --lazy --ohh February 16, 2018 @ 16:36
117584 bytes zopfli --i100 --mls2 --bsr17 --lazy --ohh February 15, 2018 @ 16:34

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

Most recent activity on June 7, 2018 @ 20:21.

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, 100,000 or 1,000,000.
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
117585 117585 117580 117582 117575 117581 117604 117581 117583 117575 117570 117584 117571 117578 117631
117575 117577 117557 117574 117558 117578 117576 117580 117584 117581 117564 117569 117598 117576 117627
117572 117591 117578 117559 117559 117558 117572 117575 117570 117571 117560 117559 117566 117577 117620
117569 117571 117570 117558 117559 117558 117569 117570 117581 117573 117560 117566 117571 117585 117589
117570 117569 117575 117557 117563 117562 117568 117585 117578 117579 117557 117561 117596 117582 117618
117576 117571 117570 117558 117558 117562 117573 117578 117585 117574 117558 117559 117583 117633 117629
117572 117575 117578 117571 117558 117561 117575 117587 117559 117556 117565 117574 117588 117590 117624
117576 117575 117553 117558 117562 117558 117572 117574 117569 117561 117571 117560 117583 117588 117575
117549 117557 117556 117558 117556 117561 117575 117574 117570 117572 117558 117559 117614 117586 117621
117561 117557 117571 117559 117556 117557 117567 117574 117572 117569 117582 117571 117614 117587 117623
117589 117588 117577 117566 117563 117562 117567 117576 117569 117558 117570 117574 117594 117583 117583
117558 117556 117558 117559 117559 117559 117560 117572 117558 117561 117563 117566 117627 117587 117618
117574 117557 117557 117558 117557 117560 117559 117571 117560 117557 117570 117572 117594 117586 117595
117556 117557 117558 117561 117570 117557 117569 117574 117561 117560 117557 117562 117594 117580 117582
117574 117574 117573 117558 117556 117567 117573 117573 117569 117571 117557 117565 117593 117582 117621
117574 117574 117573 117561 117559 117558 117560 117577 117559 117561 117570 117558 117593 117587 117618
117573 117577 117574 117558 117558 117557 117572 117574 117568 117572 117570 117557 117594 117587 117621
117574 117559 117558 117559 117558 117559 117561 117561 117561 117561 117556 117559 117583 117582 117633
117584 117573 117572 117558 117557 117559 117570 117572 117557 117557 117557 117559 117594 117587 117619
117576 117574 117570 117559 117558 117563 117575 117574 117572 117569 117556 117559 117588 117579 117627
117561 117559 117558 117559 117558 117558 117558 117562 117560 117561 117555 117562 117593 117587 117623
117556 117560 117557 117557 117557 117557 117573 117572 117559 117572 117560 117559 117594 117572 117620
117575 117574 117557 117559 117559 117559 117558 117561 117558 117560 117559 117557 117595 117587 117621

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 117584 bytes 100%
1,000 117562 bytes -22 bytes 100%
10,000 117554 bytes -8 bytes 100%
100,000 117551 bytes -3 bytes 1.16%
1,000,000 117549 bytes -2 bytes 0.29%
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
117635 bytes +86 bytes (+0.07%) +63 bytes
117671 bytes +122 bytes (+0.10%) +99 bytes
117617 bytes +68 bytes (+0.06%) +45 bytes
117572 bytes +23 bytes (+0.02%)
117625 bytes +76 bytes (+0.06%) +53 bytes
117646 bytes +97 bytes (+0.08%) +74 bytes
117640 bytes +91 bytes (+0.08%) +68 bytes
117579 bytes +30 bytes (+0.03%) +7 bytes
117633 bytes +84 bytes (+0.07%) +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.
However, support for Brotli is constantly growing - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 81104 bytes -36445 bytes (-31.00%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 87916 bytes -29633 bytes (-25.21%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 94464 bytes -23085 bytes (-19.64%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 100726 bytes -16823 bytes (-14.31%)
Brotli (Wikipedia) brotli brotli -q 11 102592 bytes -14957 bytes (-12.72%)
LZMA2 (Wikipedia) xz xz -9 104164 bytes -13385 bytes (-11.39%)
Zstandard (Wikipedia) zstd zstd -19 107158 bytes -10391 bytes (-8.84%)

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 2018.
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