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
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
23 Jun 2017 00:0086753741
24 Jun 2017 00:0070242997
25 Jun 2017 00:0069177924
26 Jun 2017 00:0078998035
27 Jun 2017 00:0080757503
28 Jun 2017 00:0082044197
29 Jun 2017 00:0087612832
30 Jun 2017 00:00143821709
1 Jul 2017 00:00166411953
2 Jul 2017 00:00157919657
3 Jul 2017 00:00182122476
4 Jul 2017 00:00181211078
5 Jul 2017 00:00195342945
6 Jul 2017 00:00213234714
7 Jul 2017 00:00197551078
8 Jul 2017 00:00171079145
9 Jul 2017 00:00172915769
10 Jul 2017 00:00207187862
11 Jul 2017 00:00163444791
12 Jul 2017 00:0086076994
13 Jul 2017 00:0077640520
14 Jul 2017 00:0076983527
15 Jul 2017 00:0067177176
16 Jul 2017 00:0066752984
17 Jul 2017 00:0076652669
18 Jul 2017 00:00123191239
19 Jul 2017 00:00201484890
20 Jul 2017 00:00202451280
21 Jul 2017 00:00191095482
22 Jul 2017 00:00175410388
23 Jul 2017 00:00180460884
24 Jul 2017 00:00206815772
25 Jul 2017 00:00209437122
26 Jul 2017 00:00210205566
27 Jul 2017 00:00205689132
28 Jul 2017 00:00204845209
29 Jul 2017 00:00180640665
30 Jul 2017 00:00180956883
31 Jul 2017 00:00208095805
1 Aug 2017 00:00195098286
2 Aug 2017 00:00208030527
3 Aug 2017 00:00210460695
4 Aug 2017 00:00205964309
5 Aug 2017 00:00177664095
6 Aug 2017 00:00185844447
7 Aug 2017 00:00216816677
8 Aug 2017 00:00222463737
9 Aug 2017 00:00220689133
10 Aug 2017 00:00216288973
11 Aug 2017 00:00219349591
12 Aug 2017 00:00200533327
13 Aug 2017 00:00196174240
14 Aug 2017 00:00211208585
15 Aug 2017 00:00221877312
16 Aug 2017 00:00224654953
17 Aug 2017 00:00240387970
18 Aug 2017 00:00236750494
19 Aug 2017 00:00217509684
20 Aug 2017 00:00210988557
21 Aug 2017 00:00227058022
22 Aug 2017 00:00237570347
23 Aug 2017 00:00233829953
24 Aug 2017 00:00227750756
25 Aug 2017 00:00221372420
26 Aug 2017 00:00195619447
27 Aug 2017 00:00198964609
28 Aug 2017 00:00231004838
29 Aug 2017 00:00242007410
30 Aug 2017 00:00238641529
31 Aug 2017 00:00235494529
1 Sep 2017 00:00197401415
2 Sep 2017 00:00174771626
3 Sep 2017 00:00180382773
4 Sep 2017 00:00206572192
5 Sep 2017 00:00229902437
6 Sep 2017 00:00232633858
7 Sep 2017 00:00198977582
8 Sep 2017 00:00180599453
9 Sep 2017 00:00168311539
10 Sep 2017 00:00183486673
11 Sep 2017 00:00212169003
12 Sep 2017 00:00198564926
13 Sep 2017 00:00192499726
14 Sep 2017 00:00115635680
15 Sep 2017 00:0070807371
16 Sep 2017 00:0058123332
17 Sep 2017 00:0062366213
18 Sep 2017 00:0074801980
19 Sep 2017 00:0075240119
20 Sep 2017 00:0072070631
21 Sep 2017 00:0073238678
22 Sep 2017 00:0066671298
23 Sep 2017 00:0057652864
24 Sep 2017 00:0062629454
25 Sep 2017 00:00127338539
26 Sep 2017 00:00183774357
27 Sep 2017 00:00174181091
28 Sep 2017 00:00169853007
29 Sep 2017 00:00162964675
30 Sep 2017 00:00144129751
1 Oct 2017 00:00152951161
2 Oct 2017 00:00193606719
3 Oct 2017 00:00119972155
4 Oct 2017 00:0078871472
5 Oct 2017 00:0081594388
6 Oct 2017 00:0073918514
7 Oct 2017 00:0064226693
8 Oct 2017 00:0066989383
9 Oct 2017 00:0075978938
10 Oct 2017 00:0076997719
11 Oct 2017 00:0077758751
12 Oct 2017 00:0077054159
13 Oct 2017 00:0072676142
14 Oct 2017 00:0063940369
15 Oct 2017 00:0070470540
16 Oct 2017 00:0082148510
17 Oct 2017 00:0085265635
18 Oct 2017 00:0079558166
19 Oct 2017 00:0077919557
20 Oct 2017 00:0073348309
21 Oct 2017 00:0066778105
22 Oct 2017 00:0073334105
23 Oct 2017 00:0084631696
24 Oct 2017 00:0085024909
25 Oct 2017 00:0081151411
26 Oct 2017 00:0079314567
27 Oct 2017 00:0075108721
28 Oct 2017 00:0066155073
29 Oct 2017 00:0071313906
30 Oct 2017 00:0079589185
31 Oct 2017 00:0076497259
1 Nov 2017 00:0077326107
2 Nov 2017 00:0077619138
3 Nov 2017 00:0076325331
4 Nov 2017 00:0067684788
5 Nov 2017 00:0071958088
6 Nov 2017 00:0082948694
7 Nov 2017 00:0085175598
8 Nov 2017 00:0087071657
9 Nov 2017 00:0086754881
10 Nov 2017 00:0080857739
11 Nov 2017 00:0071961933
12 Nov 2017 00:0076654200
13 Nov 2017 00:0089001580
14 Nov 2017 00:0091056016
15 Nov 2017 00:0089452284
16 Nov 2017 00:0092677499
17 Nov 2017 00:0089308828
18 Nov 2017 00:0079847218
19 Nov 2017 00:0084801608

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
13 Nov 2017 04:00351
13 Nov 2017 05:00350
13 Nov 2017 06:00352
13 Nov 2017 07:00351
13 Nov 2017 08:00351
13 Nov 2017 09:00344
13 Nov 2017 10:00346
13 Nov 2017 11:00349
13 Nov 2017 12:00353
13 Nov 2017 13:00351
13 Nov 2017 14:00366
13 Nov 2017 15:00354
13 Nov 2017 16:00361
13 Nov 2017 17:00363
13 Nov 2017 18:00349
13 Nov 2017 19:00362
13 Nov 2017 20:00351
13 Nov 2017 21:00358
13 Nov 2017 22:00365
13 Nov 2017 23:00358
14 Nov 2017 00:00361
14 Nov 2017 01:00355
14 Nov 2017 02:00353
14 Nov 2017 03:00361
14 Nov 2017 04:00358
14 Nov 2017 05:00358
14 Nov 2017 06:00349
14 Nov 2017 07:00361
14 Nov 2017 08:00348
14 Nov 2017 09:00339
14 Nov 2017 10:00343
14 Nov 2017 11:00346
14 Nov 2017 12:00353
14 Nov 2017 13:00337
14 Nov 2017 14:00361
14 Nov 2017 15:00358
14 Nov 2017 16:00344
14 Nov 2017 17:00346
14 Nov 2017 18:00358
14 Nov 2017 19:00337
14 Nov 2017 20:00351
14 Nov 2017 21:00347
14 Nov 2017 22:00347
14 Nov 2017 23:00360
15 Nov 2017 00:00366
15 Nov 2017 01:00355
15 Nov 2017 02:00382
15 Nov 2017 03:00347
15 Nov 2017 04:00327
15 Nov 2017 05:00339
15 Nov 2017 06:00353
15 Nov 2017 07:00344
15 Nov 2017 08:00333
15 Nov 2017 09:00344
15 Nov 2017 10:00362
15 Nov 2017 11:00337
15 Nov 2017 12:00347
15 Nov 2017 13:00343
15 Nov 2017 14:00346
15 Nov 2017 15:00334
15 Nov 2017 16:00353
15 Nov 2017 17:00375
15 Nov 2017 18:00338
15 Nov 2017 19:00346
15 Nov 2017 20:00337
15 Nov 2017 21:00331
15 Nov 2017 22:00337
15 Nov 2017 23:00346
16 Nov 2017 00:00341
16 Nov 2017 01:00343
16 Nov 2017 02:00348
16 Nov 2017 03:00352
16 Nov 2017 04:00339
16 Nov 2017 05:00346
16 Nov 2017 06:00410
16 Nov 2017 07:00396
16 Nov 2017 08:00336
16 Nov 2017 09:00352
16 Nov 2017 10:00339
16 Nov 2017 11:00337
16 Nov 2017 12:00339
16 Nov 2017 13:00345
16 Nov 2017 14:00349
16 Nov 2017 15:00340
16 Nov 2017 16:00335
16 Nov 2017 17:00338
16 Nov 2017 18:00350
16 Nov 2017 19:00345
16 Nov 2017 20:00338
16 Nov 2017 21:00340
16 Nov 2017 22:00349
16 Nov 2017 23:00334
17 Nov 2017 00:00342
17 Nov 2017 01:00345
17 Nov 2017 02:00345
17 Nov 2017 03:00330
17 Nov 2017 04:00353
17 Nov 2017 05:00439
17 Nov 2017 06:00350
17 Nov 2017 07:00371
17 Nov 2017 08:00345
17 Nov 2017 09:00333
17 Nov 2017 10:00353
17 Nov 2017 11:00332
17 Nov 2017 12:00358
17 Nov 2017 13:00348
17 Nov 2017 14:00340
17 Nov 2017 15:00347
17 Nov 2017 16:00342
17 Nov 2017 17:00341
17 Nov 2017 18:00354
17 Nov 2017 19:00347
17 Nov 2017 20:00332
17 Nov 2017 21:00344
17 Nov 2017 22:00347
17 Nov 2017 23:00342
18 Nov 2017 00:00334
18 Nov 2017 01:00343
18 Nov 2017 02:00346
18 Nov 2017 03:00338
18 Nov 2017 04:00357
18 Nov 2017 05:00352
18 Nov 2017 06:00350
18 Nov 2017 07:00343
18 Nov 2017 08:00347
18 Nov 2017 09:00340
18 Nov 2017 10:00345
18 Nov 2017 11:00352
18 Nov 2017 12:00344
18 Nov 2017 13:00345
18 Nov 2017 14:00342
18 Nov 2017 15:00347
18 Nov 2017 16:00346
18 Nov 2017 17:00360
18 Nov 2017 18:00349
18 Nov 2017 19:00362
18 Nov 2017 20:00371
18 Nov 2017 21:00349
18 Nov 2017 22:00358
18 Nov 2017 23:00360
19 Nov 2017 00:00344
19 Nov 2017 01:00346
19 Nov 2017 02:00340
19 Nov 2017 03:00347
19 Nov 2017 04:00346
19 Nov 2017 05:00339
19 Nov 2017 06:00341
19 Nov 2017 07:00341
19 Nov 2017 08:00357
19 Nov 2017 09:00337
19 Nov 2017 10:00343
19 Nov 2017 11:00342
19 Nov 2017 12:00353
19 Nov 2017 13:00352
19 Nov 2017 14:00346
19 Nov 2017 15:00349
19 Nov 2017 16:00344
19 Nov 2017 17:00368
19 Nov 2017 18:00349
19 Nov 2017 19:00347
19 Nov 2017 20:00343
19 Nov 2017 21:00355
19 Nov 2017 22:00370
19 Nov 2017 23:00366
20 Nov 2017 00:00382
20 Nov 2017 01:00375
20 Nov 2017 02:00360
20 Nov 2017 03:00352
20 Nov 2017 04:00338

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits604206214
Misses4904633

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 months2 minutes
Last 12 months20 minutes

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.