Choose a version:
30% The original file has 1620195 bytes (1,582.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 486870 bytes (475.5k, 30%).

After GZIP compression these minified files vary in size:
cdnjs
  123497 bytes (120.6k)
CDN
gzip -6 (default)
  121942 bytes (119.1k)
local copy
gzip -9
  121435 bytes (118.6k)
local copy
7zip -mx=9 -tgzip
  117276 bytes (114.5k)
local copy
libdeflate -12
  117223 bytes (114.5k)
local copy
pigz -11 -n
  117155 bytes (114.4k)
local copy
kzip -s0 -rn -b3
  117028 bytes (114.3k)
local copy
Zopfli
  116966 bytes (114.2k)
local copy
Zopfli (defluff)
  116961 bytes (114.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.18.2.min.js (or via HTTPS)

You will automatically get the smallest Ember 2.18.2 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 6531 bytes by using my Ember 2.18.2 Zopfli version instead of the best available CDN (5.58% smaller than cdnjs, 116966 vs. 123497 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 --mls8192 --bsr7 --lazy --ohh

(found February 21, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 7  --bsr7
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 (116961 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v2.18.2/ember.min.js --location | md5sum
5d855e92bfc1239201afc51853d33b00  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.18.2.min.zopfli.js.gz | md5sum
5d855e92bfc1239201afc51853d33b00  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v2.18.2/ember.min.js --location | sha1sum
32c73d050f1f175a2eed9471a14af6d5fb18398d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.18.2.min.zopfli.js.gz | sha1sum
32c73d050f1f175a2eed9471a14af6d5fb18398d  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
cdnjs 123497 bytes 5d855e92bfc1239201afc51853d33b00 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
116966 bytes -1 byte zopfli --i1000000 --mls8192 --bsr7 --lazy --ohh February 21, 2018 @ 07:02
116967 bytes -5 bytes zopfli --i100000 --mls8192 --bsr7 --lazy --ohh February 16, 2018 @ 23:58
116972 bytes -22 bytes zopfli --i10000 --mls8192 --bsr7 --lazy --ohh February 16, 2018 @ 17:55
116994 bytes -27 bytes zopfli --i1000 --mls8192 --bsr7 --lazy --ohh February 16, 2018 @ 17:15
117021 bytes -1 byte zopfli --i1000 --mls128 --bsr16 --lazy --ohh February 16, 2018 @ 16:29
117022 bytes zopfli --i100 --mls8192 --bsr7 --lazy --ohh February 15, 2018 @ 16:32

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

Most recent activity on February 21, 2018 @ 08:45.

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
117038 117030 117029 117031 117033 117034 117035 117034 117033 117031 117027 117025 117027 117043 117080
117023 117022 117035 117033 117029 117031 117020 117025 117026 117027 117024 117026 117029 117036 117073
117031 117034 117024 117020 117027 117024 117030 117018 117021 117023 117023 117020 117070 117033 117027
117024 117022 117024 117021 117025 117030 117035 117029 117030 117023 117022 117022 116966 117016 117044
117021 117020 117041 117023 117039 117023 117034 117021 117022 117026 117020 117021 117021 117032 117043
117025 117021 117024 117022 117021 117026 117032 117020 117020 117022 117023 117023 117020 117036 117071
117023 117020 117026 117028 117029 117029 117022 117023 117032 117028 117026 117019 117018 117038 117038
117023 117020 117014 117021 117023 117030 117029 117021 117023 117021 117021 117024 117020 117034 117039
117020 117020 117021 117021 117019 117025 117023 117023 117021 117022 117019 117018 117070 117036 117071
117026 117020 117015 117024 117018 117009 117013 117017 117027 117023 117044 117035 117071 117039 117036
117032 117032 117022 117020 117013 117022 117024 117019 117024 117021 117030 117018 117021 117037 117073
117026 117024 117019 117021 117020 117025 117024 117024 117020 117023 117018 117022 117070 117031 117042
117026 117022 117020 117022 117021 117020 117014 117016 117017 117023 117028 117039 117018 117035 117029
117020 117022 117022 117023 117028 117022 117022 117019 117025 117018 117022 117021 117017 117037 117071
117026 117028 117019 117021 117017 117021 117029 117015 117022 117023 117022 117019 117020 117035 117070
117026 117029 117019 117020 117023 117020 117025 117022 117026 117020 117028 117018 117038 117035 117071
117026 117029 117020 117023 117019 117015 117023 117021 117022 117023 117026 117019 117018 117037 117073
117029 117024 117024 117023 117023 117023 117029 117016 117022 117023 117019 117021 117019 117035 117070
117027 117025 117028 117020 117018 117022 117018 117019 117019 117019 117022 117028 117021 117036 117070
117015 117015 117031 117021 117019 117018 117030 117018 117021 117019 117028 117049 117021 117034 117040
117021 117023 117020 117021 117024 117023 117024 117023 117019 117023 117027 117022 117038 117036 117070
117020 117023 117022 117020 117021 117023 117022 117014 117023 117022 117016 117020 117018 117036 117077
117025 117020 117021 117025 117019 117022 117023 117015 117020 117024 117029 117018 117019 117021 117071

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 117022 bytes 100%
1,000 116994 bytes -28 bytes 100%
10,000 116972 bytes -22 bytes 100%
100,000 116967 bytes -5 bytes 0.58%
1,000,000 116966 bytes -1 byte 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
117113 bytes +147 bytes (+0.13%) +85 bytes
117096 bytes +130 bytes (+0.11%) +68 bytes
117067 bytes +101 bytes (+0.09%) +39 bytes
117028 bytes +62 bytes (+0.05%)
117085 bytes +119 bytes (+0.10%) +57 bytes
117113 bytes +147 bytes (+0.13%) +85 bytes
117108 bytes +142 bytes (+0.12%) +80 bytes
117045 bytes +79 bytes (+0.07%) +17 bytes
117086 bytes +120 bytes (+0.10%) +58 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 80724 bytes -36242 bytes (-30.99%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 87592 bytes -29374 bytes (-25.11%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 94012 bytes -22954 bytes (-19.62%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 100355 bytes -16611 bytes (-14.20%)
Brotli (Wikipedia) brotli brotli -q 11 102238 bytes -14728 bytes (-12.59%)
LZMA2 (Wikipedia) xz xz -9 103768 bytes -13198 bytes (-11.28%)
Zstandard (Wikipedia) zstd zstd -19 106748 bytes -10218 bytes (-8.74%)

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