Currently best Zopfli settings

Save 879 bytes by using my Vue 1.0.9 Zopfli version instead of the best available CDN (3.81% smaller than unpkg, 23081 vs. 23960 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 --bsr20 --lazy --ohh

(found April 9, 2017)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	20	--bsr20
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 2 more bytes (23079 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-1.0.9.min.js --location | md5sum
ee074b929d846915705b79d776a0f4a0  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-1.0.9.min.zopfli.js.gz | md5sum
ee074b929d846915705b79d776a0f4a0  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-1.0.9.min.js --location | sha1sum
8ac0d7be42499e4854820d8d592048cba7dd81e8  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-1.0.9.min.zopfli.js.gz | sha1sum
8ac0d7be42499e4854820d8d592048cba7dd81e8  -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	28033 bytes	ee074b929d846915705b79d776a0f4a0	(invalid)
cdnjs	24209 bytes	ee074b929d846915705b79d776a0f4a0	(invalid)
jsdelivr	23973 bytes	ee074b929d846915705b79d776a0f4a0	(invalid)
unpkg	23960 bytes	ee074b929d846915705b79d776a0f4a0	April 6, 2017 @ 17:25

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

Other Versions

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

2.6.14, 2.6.13, 2.6.12, 2.6.11, 2.6.10, 2.6.9, 2.6.8, 2.6.7, 2.6.6, 2.6.5, 2.6.4, 2.6.3, 2.6.2, 2.6.1, 2.6.0, 2.5.22, 2.5.21, 2.5.20, 2.5.19, 2.5.18, 2.5.17, 2.5.16, 2.5.15, 2.5.14, 2.5.13, 2.5.12, 2.5.11, 2.5.10, 2.5.9, 2.5.8, 2.5.7, 2.5.6, 2.5.5, 2.5.4, 2.5.3, 2.5.2, 2.5.1, 2.5.0, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0, 2.3.4, 2.3.3, 2.3.2, 2.3.1, 2.3.0, 2.2.6, 2.2.5, 2.2.4, 2.2.3, 2.2.2, 2.2.1, 2.2.0, 2.1.10, 2.1.9, 2.1.8, 2.1.7, 2.1.6, 2.1.5, 2.1.4, 2.1.3, 2.1.2, 2.1.1, 2.1.0, 2.0.8, 2.0.7, 2.0.6, 2.0.5, 2.0.4, 2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.0.28, 1.0.27, 1.0.26, 1.0.25, 1.0.24, 1.0.23, 1.0.22, 1.0.21, 1.0.20, 1.0.19, 1.0.18, 1.0.17, 1.0.16, 1.0.15, 1.0.14, 1.0.13, 1.0.12, 1.0.11, 1.0.10, 1.0.9,
0.10.6, 0.10.5, 0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10.0,
0.9.3, 0.9.2, 0.9.1, 0.9.0

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

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
23081 bytes	-1 byte	zopfli --i100000 --mls8 --bsr20 --lazy --ohh	April 9, 2017 @ 06:34
23082 bytes	-1 byte	zopfli --i10000 --mls8 --bsr20 --lazy --ohh	April 7, 2017 @ 01:29
23083 bytes	-1 byte	zopfli --i10000 --mls8 --bsr25 --lazy --ohh	April 7, 2017 @ 00:47
23084 bytes	-3 bytes	zopfli --i10000 --mls8192 --bsr16 --lazy --ohh	April 7, 2017 @ 00:43
23087 bytes	-3 bytes	zopfli --i1000 --mls8 --bsr20 --lazy --ohh	April 6, 2017 @ 19:06
23090 bytes	-3 bytes	zopfli --i1000 --mls16384 --bsr12 --lazy --ohh	April 6, 2017 @ 18:56
23093 bytes	–	zopfli --i100 --mls16384 --bsr12 --lazy --ohh	April 6, 2017 @ 18:36

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

Most recent activity on July 20, 2020 @ 12:51.

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
2	23099	23100	23100	23100	23099	23099	23101	23106	23104	23103	23101	23089	23097	23109	23109
4	23098	23099	23106	23098	23104	23105	23104	23095	23099	23100	23097	23100	23099	23107	23101
6	23099	23099	23090	23096	23105	23104	23106	23105	23099	23096	23095	23101	23100	23091	23101
7	23098	23099	23107	23106	23105	23104	23097	23100	23099	23095	23095	23102	23101	23089	23099
8	23099	23097	23088	23097	23099	23089	23106	23099	23099	23096	23096	23103	23100	23090	23101
9	23104	23097	23105	23106	23106	23106	23106	23099	23099	23099	23097	23102	23100	23109	23097
10	23097	23101	23105	23106	23100	23104	23106	23095	23099	23096	23100	23102	23099	23090	23101
11	23098	23097	23105	23097	23105	23105	23106	23105	23099	23104	23095	23102	23100	23092	23098
12	23098	23098	23105	23104	23102	23106	23106	23105	23105	23104	23100	23106	23093	23087	23101
13	23099	23098	23081	23106	23098	23105	23106	23099	23099	23095	23100	23103	23100	23102	23102
14	23100	23097	23099	23106	23105	23106	23106	23106	23099	23099	23100	23104	23100	23089	23101
15	23099	23097	23105	23106	23105	23106	23106	23099	23099	23105	23095	23102	23100	23088	23100
16	23104	23104	23082	23086	23103	23104	23106	23081	23099	23094	23100	23105	23084	23102	23102
17	23097	23098	23099	23106	23103	23106	23105	23104	23099	23094	23100	23104	23100	23089	23100
18	23099	23098	23106	23107	23107	23105	23105	23099	23099	23096	23101	23102	23100	23090	23101
19	23097	23099	23090	23106	23107	23104	23106	23099	23104	23099	23100	23105	23100	23088	23105
20	23098	23103	23081	23106	23106	23104	23105	23105	23106	23095	23100	23103	23101	23088	23101
21	23098	23100	23105	23107	23105	23106	23106	23107	23099	23095	23096	23098	23100	23088	23101
22	23098	23096	23088	23105	23103	23106	23107	23106	23099	23095	23100	23104	23100	23102	23101
23	23098	23097	23105	23106	23105	23104	23107	23105	23099	23096	23100	23100	23100	23091	23101
25	23104	23098	23083	23086	23107	23105	23106	23105	23104	23096	23100	23103	23101	23092	23102
30	23095	23102	23105	23087	23106	23106	23106	23099	23099	23095	23100	23102	23102	23091	23101
40	23097	23103	23106	23099	23103	23104	23106	23099	23099	23099	23101	23102	23099	23089	23101

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	23093 bytes	–	100%
1,000	23087 bytes	-6 bytes	100%
10,000	23082 bytes	-5 bytes	100%
100,000	23081 bytes	-1 byte	1.74%
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
(any)	23143 bytes	+62 bytes (+0.27%)	+14 bytes
1	23145 bytes	+64 bytes (+0.28%)	+16 bytes
2	23139 bytes	+58 bytes (+0.25%)	+10 bytes
3	23152 bytes	+71 bytes (+0.31%)	+23 bytes
4	23129 bytes	+48 bytes (+0.21%)	–
5	23173 bytes	+92 bytes (+0.40%)	+44 bytes
6	23189 bytes	+108 bytes (+0.47%)	+60 bytes
7	23236 bytes	+155 bytes (+0.67%)	+107 bytes
8	23273 bytes	+192 bytes (+0.83%)	+144 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 - for example, your browser actually supports it !

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	19260 bytes	-3821 bytes (-16.55%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	19512 bytes	-3569 bytes (-15.46%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	20003 bytes	-3078 bytes (-13.34%)
Brotli (Wikipedia)	brotli	brotli -q 11	21587 bytes	-1494 bytes (-6.47%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	21905 bytes	-1176 bytes (-5.10%)
LZMA2 (Wikipedia)	xz	xz -9	22412 bytes	-669 bytes (-2.90%)
Zstandard (Wikipedia)	zstd	zstd -19	22886 bytes	-195 bytes (-0.84%)

Detailled Analysis