Currently best Zopfli settings

Save 890 bytes by using my Vue 1.0.11 Zopfli version instead of the best available CDN (3.82% smaller than unpkg, 23299 vs. 24189 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 --mls4 --bsr17 --lazy --ohh

(found April 9, 2017)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	4	--mls4
block splitting recursion	17	--bsr17
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 1 more byte (23298 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-1.0.11.min.js --location | md5sum
af895702901bb31ca7fbfd814dc04aed  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-1.0.11.min.zopfli.js.gz | md5sum
af895702901bb31ca7fbfd814dc04aed  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-1.0.11.min.js --location | sha1sum
76501eb3cbe86328945a5b5a1ab3bc5295c807e6  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-1.0.11.min.zopfli.js.gz | sha1sum
76501eb3cbe86328945a5b5a1ab3bc5295c807e6  -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	28305 bytes	af895702901bb31ca7fbfd814dc04aed	(invalid)
cdnjs	24435 bytes	af895702901bb31ca7fbfd814dc04aed	(invalid)
jsdelivr	24203 bytes	af895702901bb31ca7fbfd814dc04aed	(invalid)
unpkg	24189 bytes	af895702901bb31ca7fbfd814dc04aed	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
23299 bytes	-1 byte	zopfli --i100000 --mls4 --bsr17 --lazy --ohh	April 9, 2017 @ 09:05
23300 bytes	-2 bytes	zopfli --i10000 --mls4 --bsr23 --lazy --ohh	April 7, 2017 @ 02:37
23302 bytes	-1 byte	zopfli --i10000 --mls8192 --bsr40 --lazy --ohh	April 7, 2017 @ 02:35
23303 bytes	-2 bytes	zopfli --i10000 --mls8192 --bsr22 --lazy --ohh	April 7, 2017 @ 02:03
23305 bytes	-2 bytes	zopfli --i1000 --mls8192 --bsr22 --lazy --ohh	April 6, 2017 @ 19:24
23307 bytes	-8 bytes	zopfli --i1000 --mls4 --bsr20 --lazy --ohh	April 6, 2017 @ 19:02
23315 bytes	–	zopfli --i100 --mls4 --bsr23 --lazy --ohh	April 6, 2017 @ 18:20

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 @ 12:50.

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	23317	23317	23317	23317	23321	23310	23312	23321	23321	23319	23308	23304	23305	23330	23325
4	23323	23324	23326	23327	23324	23325	23327	23323	23319	23319	23322	23321	23317	23328	23320
6	23324	23324	23309	23323	23323	23323	23324	23323	23318	23319	23320	23314	23315	23316	23322
7	23323	23317	23324	23321	23325	23323	23323	23322	23319	23320	23323	23317	23313	23314	23321
8	23301	23301	23307	23322	23318	23323	23324	23323	23318	23318	23323	23313	23312	23316	23325
9	23324	23317	23324	23321	23327	23325	23325	23319	23318	23319	23322	23317	23313	23318	23319
10	23314	23299	23327	23323	23322	23323	23324	23322	23318	23318	23322	23314	23313	23311	23319
11	23324	23301	23323	23321	23325	23323	23325	23322	23318	23319	23321	23317	23313	23313	23322
12	23323	23325	23309	23321	23323	23325	23324	23324	23319	23319	23322	23314	23310	23320	23321
13	23325	23314	23308	23322	23324	23324	23324	23322	23318	23321	23319	23314	23312	23316	23321
14	23324	23301	23322	23322	23318	23323	23324	23322	23318	23322	23324	23317	23310	23319	23319
15	23324	23317	23324	23322	23325	23323	23323	23322	23319	23320	23320	23313	23313	23313	23321
16	23322	23321	23307	23317	23321	23322	23321	23318	23318	23322	23322	23314	23312	23318	23323
17	23321	23299	23309	23323	23326	23323	23325	23327	23319	23320	23325	23317	23312	23322	23322
18	23324	23323	23325	23322	23325	23322	23324	23322	23318	23318	23321	23314	23312	23323	23321
19	23322	23323	23309	23323	23324	23324	23325	23322	23319	23320	23324	23313	23312	23316	23320
20	23313	23301	23322	23323	23324	23324	23324	23319	23318	23319	23322	23317	23312	23322	23319
21	23324	23324	23326	23322	23324	23323	23324	23326	23318	23319	23321	23317	23312	23318	23317
22	23303	23302	23324	23323	23324	23325	23324	23323	23319	23322	23321	23321	23303	23329	23319
23	23324	23299	23324	23321	23325	23324	23325	23323	23319	23319	23322	23317	23314	23319	23318
25	23322	23301	23326	23322	23325	23327	23324	23323	23318	23318	23322	23314	23309	23324	23319
30	23321	23299	23324	23322	23325	23325	23322	23322	23319	23319	23322	23325	23312	23322	23319
40	23326	23326	23326	23322	23326	23325	23325	23322	23319	23319	23322	23310	23302	23322	23319

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	23315 bytes	–	100%
1,000	23305 bytes	-10 bytes	100%
10,000	23300 bytes	-5 bytes	100%
100,000	23299 bytes	-1 byte	3.48%
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)	23361 bytes	+62 bytes (+0.27%)	+10 bytes
1	23361 bytes	+62 bytes (+0.27%)	+10 bytes
2	23365 bytes	+66 bytes (+0.28%)	+14 bytes
3	23374 bytes	+75 bytes (+0.32%)	+23 bytes
4	23351 bytes	+52 bytes (+0.22%)	–
5	23387 bytes	+88 bytes (+0.38%)	+36 bytes
6	23418 bytes	+119 bytes (+0.51%)	+67 bytes
7	23458 bytes	+159 bytes (+0.68%)	+107 bytes
8	23485 bytes	+186 bytes (+0.80%)	+134 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	19403 bytes	-3896 bytes (-16.72%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	19709 bytes	-3590 bytes (-15.41%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	20223 bytes	-3076 bytes (-13.20%)
Brotli (Wikipedia)	brotli	brotli -q 11	21790 bytes	-1509 bytes (-6.48%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	22112 bytes	-1187 bytes (-5.09%)
LZMA2 (Wikipedia)	xz	xz -9	22616 bytes	-683 bytes (-2.93%)
Zstandard (Wikipedia)	zstd	zstd -19	23099 bytes	-200 bytes (-0.86%)

Detailled Analysis