Polyfill.io

Usage and performance

The public instance of the polyfill service is hosted by the Financial Times, with the generous support of Fastly, who provide CDN distribution. View Fastly network map

Traffic volume

This shows the number of requests we have served per day, over the last 180 days, measured by Fastly:

DateRequests
25 Dec 2016 00:0019624526
26 Dec 2016 00:0025538280
27 Dec 2016 00:0028313547
28 Dec 2016 00:0027086156
29 Dec 2016 00:0026405218
30 Dec 2016 00:0024943598
31 Dec 2016 00:0021225557
1 Jan 2017 00:0020654814
2 Jan 2017 00:0025885081
3 Jan 2017 00:0029892864
4 Jan 2017 00:0030166919
5 Jan 2017 00:0030594723
6 Jan 2017 00:0029425708
7 Jan 2017 00:0025402726
8 Jan 2017 00:0025982172
9 Jan 2017 00:0032314246
10 Jan 2017 00:0031809252
11 Jan 2017 00:0032536835
12 Jan 2017 00:0032799886
13 Jan 2017 00:0029391192
14 Jan 2017 00:0025300299
15 Jan 2017 00:0027282852
16 Jan 2017 00:0032524907
17 Jan 2017 00:0032415786
18 Jan 2017 00:0033365658
19 Jan 2017 00:0035120602
20 Jan 2017 00:0041188974
21 Jan 2017 00:0030927077
22 Jan 2017 00:0029338687
23 Jan 2017 00:0034284932
24 Jan 2017 00:0034671031
25 Jan 2017 00:0035619948
26 Jan 2017 00:0036071213
27 Jan 2017 00:0032465983
28 Jan 2017 00:0026966448
29 Jan 2017 00:0029740069
30 Jan 2017 00:0036063509
31 Jan 2017 00:0036152486
1 Feb 2017 00:0038016618
2 Feb 2017 00:0038092744
3 Feb 2017 00:0036796339
4 Feb 2017 00:0032491273
5 Feb 2017 00:0032453018
6 Feb 2017 00:0036860319
7 Feb 2017 00:0035571731
8 Feb 2017 00:0036412197
9 Feb 2017 00:0036514897
10 Feb 2017 00:0033490604
11 Feb 2017 00:0027995607
12 Feb 2017 00:0029223036
13 Feb 2017 00:0036885381
14 Feb 2017 00:0035887992
15 Feb 2017 00:0038363219
16 Feb 2017 00:0038642420
17 Feb 2017 00:0034407156
18 Feb 2017 00:0028874822
19 Feb 2017 00:0030971428
20 Feb 2017 00:0037275115
21 Feb 2017 00:0038420294
22 Feb 2017 00:0037623473
23 Feb 2017 00:0039089757
24 Feb 2017 00:0036219130
25 Feb 2017 00:0034519605
26 Feb 2017 00:0035891521
27 Feb 2017 00:0043712007
28 Feb 2017 00:0045064797
1 Mar 2017 00:0045392374
2 Mar 2017 00:0046631873
3 Mar 2017 00:0042165614
4 Mar 2017 00:0037713394
5 Mar 2017 00:0039805594
6 Mar 2017 00:0046066982
7 Mar 2017 00:0045176879
8 Mar 2017 00:0044774385
9 Mar 2017 00:0047826146
10 Mar 2017 00:0045210137
11 Mar 2017 00:0037960796
12 Mar 2017 00:0038080093
13 Mar 2017 00:0044997769
14 Mar 2017 00:0044341787
15 Mar 2017 00:0045435363
16 Mar 2017 00:0046967559
17 Mar 2017 00:0043404160
18 Mar 2017 00:0038636175
19 Mar 2017 00:0040990946
20 Mar 2017 00:0046873678
21 Mar 2017 00:0046191872
22 Mar 2017 00:0054879586
23 Mar 2017 00:0051247835
24 Mar 2017 00:0043630492
25 Mar 2017 00:0037657863
26 Mar 2017 00:0038374304
27 Mar 2017 00:0046018476
28 Mar 2017 00:0047087794
29 Mar 2017 00:0050447958
30 Mar 2017 00:0051112994
31 Mar 2017 00:0047293919
1 Apr 2017 00:0041000670
2 Apr 2017 00:0043531550
3 Apr 2017 00:0051512891
4 Apr 2017 00:0051372073
5 Apr 2017 00:0054481975
6 Apr 2017 00:0056145273
7 Apr 2017 00:0052098787
8 Apr 2017 00:0043880878
9 Apr 2017 00:0045799887
10 Apr 2017 00:0053918800
11 Apr 2017 00:0052654208
12 Apr 2017 00:0052502250
13 Apr 2017 00:0054089240
14 Apr 2017 00:0046311543
15 Apr 2017 00:0041134631
16 Apr 2017 00:0041256184
17 Apr 2017 00:0049758481
18 Apr 2017 00:0052956422
19 Apr 2017 00:0062803694
20 Apr 2017 00:0057519252
21 Apr 2017 00:0052213352
22 Apr 2017 00:0044706951
23 Apr 2017 00:0046211183
24 Apr 2017 00:0051760510
25 Apr 2017 00:0052904021
26 Apr 2017 00:0054639242
27 Apr 2017 00:0054814559
28 Apr 2017 00:0049165192
29 Apr 2017 00:0041450175
30 Apr 2017 00:0042086729
1 May 2017 00:0048927702
2 May 2017 00:0052240395
3 May 2017 00:0054854825
4 May 2017 00:0056176590
5 May 2017 00:0049582172
6 May 2017 00:0042364406
7 May 2017 00:0045425783
8 May 2017 00:0055427229
9 May 2017 00:0053459291
10 May 2017 00:0058407788
11 May 2017 00:0055479307
12 May 2017 00:0052323298
13 May 2017 00:0046430394
14 May 2017 00:0046762851
15 May 2017 00:0072273424
16 May 2017 00:00122376199
17 May 2017 00:00146982847
18 May 2017 00:00149453129
19 May 2017 00:00132430263
20 May 2017 00:00103930642
21 May 2017 00:00113328523
22 May 2017 00:00156497089
23 May 2017 00:00204259789
24 May 2017 00:00185528805
25 May 2017 00:00190866187
26 May 2017 00:00177348224
27 May 2017 00:00151034285
28 May 2017 00:00154511357
29 May 2017 00:00169294032
30 May 2017 00:00180873768
31 May 2017 00:00190869991
1 Jun 2017 00:00169455839
2 Jun 2017 00:00163791749
3 Jun 2017 00:00142710187
4 Jun 2017 00:00154835578
5 Jun 2017 00:00181687513
6 Jun 2017 00:00187751090
7 Jun 2017 00:00188375967
8 Jun 2017 00:00198527143
9 Jun 2017 00:00199642900
10 Jun 2017 00:00165399690
11 Jun 2017 00:00171181932
12 Jun 2017 00:00134713967
13 Jun 2017 00:0090394163
14 Jun 2017 00:0092045891
15 Jun 2017 00:0086400871
16 Jun 2017 00:0080624872
17 Jun 2017 00:0068688951
18 Jun 2017 00:0070718368
19 Jun 2017 00:00162513297
20 Jun 2017 00:00211093795
21 Jun 2017 00:00214219084
22 Jun 2017 00:00174840445

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
16 Jun 2017 14:00356
16 Jun 2017 15:00333
16 Jun 2017 16:00337
16 Jun 2017 17:00373
16 Jun 2017 18:00358
16 Jun 2017 19:00377
16 Jun 2017 20:00334
16 Jun 2017 21:00338
16 Jun 2017 22:00334
16 Jun 2017 23:00338
17 Jun 2017 00:00326
17 Jun 2017 01:00346
17 Jun 2017 02:00327
17 Jun 2017 03:00332
17 Jun 2017 04:00327
17 Jun 2017 05:00330
17 Jun 2017 06:00330
17 Jun 2017 07:00341
17 Jun 2017 08:00421
17 Jun 2017 09:00363
17 Jun 2017 10:00356
17 Jun 2017 11:00354
17 Jun 2017 12:00360
17 Jun 2017 13:00357
17 Jun 2017 14:00347
17 Jun 2017 15:00365
17 Jun 2017 16:00368
17 Jun 2017 17:00347
17 Jun 2017 18:00365
17 Jun 2017 19:00360
17 Jun 2017 20:00347
17 Jun 2017 21:00347
17 Jun 2017 22:00349
17 Jun 2017 23:00360
18 Jun 2017 00:00354
18 Jun 2017 01:00342
18 Jun 2017 02:00345
18 Jun 2017 03:00356
18 Jun 2017 04:00340
18 Jun 2017 05:00350
18 Jun 2017 06:00357
18 Jun 2017 07:00321
18 Jun 2017 08:00326
18 Jun 2017 09:00332
18 Jun 2017 10:00329
18 Jun 2017 11:00339
18 Jun 2017 12:00324
18 Jun 2017 13:00323
18 Jun 2017 14:00339
18 Jun 2017 15:00338
18 Jun 2017 16:00344
18 Jun 2017 17:00330
18 Jun 2017 18:00340
18 Jun 2017 19:00343
18 Jun 2017 20:00332
18 Jun 2017 21:00330
18 Jun 2017 22:00325
18 Jun 2017 23:00333
19 Jun 2017 00:00336
19 Jun 2017 01:00324
19 Jun 2017 02:00352
19 Jun 2017 03:00347
19 Jun 2017 04:00352
19 Jun 2017 05:00321
19 Jun 2017 06:00333
19 Jun 2017 07:00339
19 Jun 2017 08:00357
19 Jun 2017 09:00366
19 Jun 2017 10:00357
19 Jun 2017 11:00350
19 Jun 2017 12:00367
19 Jun 2017 13:00369
19 Jun 2017 14:00373
19 Jun 2017 15:00353
19 Jun 2017 16:00355
19 Jun 2017 17:00330
19 Jun 2017 18:00349
19 Jun 2017 19:00342
19 Jun 2017 20:00352
19 Jun 2017 21:00351
19 Jun 2017 22:00357
19 Jun 2017 23:00352
20 Jun 2017 00:00343
20 Jun 2017 01:00335
20 Jun 2017 02:00358
20 Jun 2017 03:00340
20 Jun 2017 04:00351
20 Jun 2017 05:00367
20 Jun 2017 06:00353
20 Jun 2017 07:00418
20 Jun 2017 08:00332
20 Jun 2017 09:00321
20 Jun 2017 10:00325
20 Jun 2017 11:00320
20 Jun 2017 12:00324
20 Jun 2017 13:00325
20 Jun 2017 14:00317
20 Jun 2017 15:00327
20 Jun 2017 16:00339
20 Jun 2017 17:00345
20 Jun 2017 18:00332
20 Jun 2017 19:00402
20 Jun 2017 20:00345
20 Jun 2017 21:00344
20 Jun 2017 22:00324
20 Jun 2017 23:00355
21 Jun 2017 00:00336
21 Jun 2017 01:00326
21 Jun 2017 02:00334
21 Jun 2017 03:00331
21 Jun 2017 04:00325
21 Jun 2017 05:00336
21 Jun 2017 06:00336
21 Jun 2017 07:00341
21 Jun 2017 08:00337
21 Jun 2017 09:00329
21 Jun 2017 10:00329
21 Jun 2017 11:00325
21 Jun 2017 12:00328
21 Jun 2017 13:00337
21 Jun 2017 14:00345
21 Jun 2017 15:00348
21 Jun 2017 16:00357
21 Jun 2017 17:00337
21 Jun 2017 18:00339
21 Jun 2017 19:00327
21 Jun 2017 20:00350
21 Jun 2017 21:00339
21 Jun 2017 22:00326
21 Jun 2017 23:00338
22 Jun 2017 00:00345
22 Jun 2017 01:00347
22 Jun 2017 02:00619
22 Jun 2017 03:00339
22 Jun 2017 04:00344
22 Jun 2017 05:00357
22 Jun 2017 06:00343
22 Jun 2017 07:00337
22 Jun 2017 08:00347
22 Jun 2017 09:00353
22 Jun 2017 10:00354
22 Jun 2017 11:00378
22 Jun 2017 12:00352
22 Jun 2017 13:00363
22 Jun 2017 14:00379
22 Jun 2017 15:00361
22 Jun 2017 16:00356
22 Jun 2017 17:00346
22 Jun 2017 18:00347
22 Jun 2017 19:00344
22 Jun 2017 20:00370
22 Jun 2017 21:00350
22 Jun 2017 22:00344
22 Jun 2017 23:00358
23 Jun 2017 00:00342
23 Jun 2017 01:00596
23 Jun 2017 02:00366
23 Jun 2017 03:00355
23 Jun 2017 04:00355
23 Jun 2017 05:00354
23 Jun 2017 06:00340
23 Jun 2017 07:00344
23 Jun 2017 08:00598
23 Jun 2017 09:00348
23 Jun 2017 10:00345
23 Jun 2017 11:00372
23 Jun 2017 12:00344
23 Jun 2017 13:00352
23 Jun 2017 14:00363

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits964092850
Misses4787828

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 monthsNone
Last 12 monthsan hour

Caching responses that vary by User-Agent is very hard to do with good cache performance. We use a custom Fastly VCL configuration that separates the UA normalisation from the polyfill bundle.

Network performance in detail

95th percentile and median resource timing metrics, broken down by Fastly edge point of presence, measured using the resource timing API from live polyfill service requests that opted in to anonymously report performance data. Last 30 days, showing only POPs that have served more than 10000 RUM-enabled requests.

PoP Sample Per connection phase (95th percentile and median) Overall

Only non-zero samples are counted, which in practice means there are far fewer DNS lookup and TCP connect datapoints, because if reusing a keep-alive connection, both will be zero. Timings for individual connection phases do not sum to the overall RTT because, for example, the request that exhibits the 95th percentile DNS time, will most likely not also be the 95th percentile on all other connection metrics.

Typically Polyfill.io is loaded at a point where the browser is very busy. To speed up loading, consider using preconnect or preload.