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
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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
16 Sep 2017 23:00407
17 Sep 2017 00:00419
17 Sep 2017 01:00422
17 Sep 2017 02:00407
17 Sep 2017 03:00435
17 Sep 2017 04:00466
17 Sep 2017 05:00448
17 Sep 2017 06:00451
17 Sep 2017 07:00434
17 Sep 2017 08:00442
17 Sep 2017 09:00435
17 Sep 2017 10:00405
17 Sep 2017 11:00395
17 Sep 2017 12:00349
17 Sep 2017 13:00355
17 Sep 2017 14:00367
17 Sep 2017 15:00365
17 Sep 2017 16:00381
17 Sep 2017 17:00369
17 Sep 2017 18:00370
17 Sep 2017 19:00388
17 Sep 2017 20:00367
17 Sep 2017 21:00368
17 Sep 2017 22:00381
17 Sep 2017 23:00385
18 Sep 2017 00:00364
18 Sep 2017 01:00363
18 Sep 2017 02:00366
18 Sep 2017 03:00362
18 Sep 2017 04:00376
18 Sep 2017 05:00355
18 Sep 2017 06:00353
18 Sep 2017 07:00361
18 Sep 2017 08:00350
18 Sep 2017 09:00362
18 Sep 2017 10:00360
18 Sep 2017 11:00366
18 Sep 2017 12:00357
18 Sep 2017 13:00365
18 Sep 2017 14:00460
18 Sep 2017 15:00375
18 Sep 2017 16:00375
18 Sep 2017 17:00370
18 Sep 2017 18:00360
18 Sep 2017 19:00388
18 Sep 2017 20:00368
18 Sep 2017 21:00368
18 Sep 2017 22:00373
18 Sep 2017 23:00367
19 Sep 2017 00:00363
19 Sep 2017 01:00363
19 Sep 2017 02:00374
19 Sep 2017 03:00386
19 Sep 2017 04:00359
19 Sep 2017 05:00352
19 Sep 2017 06:00371
19 Sep 2017 07:00369
19 Sep 2017 08:00361
19 Sep 2017 09:00374
19 Sep 2017 10:00362
19 Sep 2017 11:00366
19 Sep 2017 12:00371
19 Sep 2017 13:00616
19 Sep 2017 14:00469
19 Sep 2017 15:00378
19 Sep 2017 16:00363
19 Sep 2017 17:00368
19 Sep 2017 18:00373
19 Sep 2017 19:00369
19 Sep 2017 20:00374
19 Sep 2017 21:00367
19 Sep 2017 22:00362
19 Sep 2017 23:00345
20 Sep 2017 00:00340
20 Sep 2017 01:00347
20 Sep 2017 02:00358
20 Sep 2017 03:00349
20 Sep 2017 04:00343
20 Sep 2017 05:00346
20 Sep 2017 06:00352
20 Sep 2017 07:00345
20 Sep 2017 08:00340
20 Sep 2017 09:00342
20 Sep 2017 10:00340
20 Sep 2017 11:00346
20 Sep 2017 12:00331
20 Sep 2017 13:00343
20 Sep 2017 14:00350
20 Sep 2017 15:00346
20 Sep 2017 16:00351
20 Sep 2017 17:00351
20 Sep 2017 18:00414
20 Sep 2017 19:00351
20 Sep 2017 20:00348
20 Sep 2017 21:00350
20 Sep 2017 22:00342
20 Sep 2017 23:00351
21 Sep 2017 00:00338
21 Sep 2017 01:00345
21 Sep 2017 02:00359
21 Sep 2017 03:00345
21 Sep 2017 04:00367
21 Sep 2017 05:00352
21 Sep 2017 06:00356
21 Sep 2017 07:00359
21 Sep 2017 08:00362
21 Sep 2017 09:00352
21 Sep 2017 10:00345
21 Sep 2017 11:00342
21 Sep 2017 12:00345
21 Sep 2017 13:00367
21 Sep 2017 14:00349
21 Sep 2017 15:00345
21 Sep 2017 16:00346
21 Sep 2017 17:00596
21 Sep 2017 18:00340
21 Sep 2017 19:00357
21 Sep 2017 20:00359
21 Sep 2017 21:00350
21 Sep 2017 22:00319
21 Sep 2017 23:00308
22 Sep 2017 00:00303
22 Sep 2017 01:00301
22 Sep 2017 02:00323
22 Sep 2017 03:00322
22 Sep 2017 04:00314
22 Sep 2017 05:00307
22 Sep 2017 06:00358
22 Sep 2017 07:00306
22 Sep 2017 08:00298
22 Sep 2017 09:00307
22 Sep 2017 10:00310
22 Sep 2017 11:00307
22 Sep 2017 12:00318
22 Sep 2017 13:00307
22 Sep 2017 14:00313
22 Sep 2017 15:00331
22 Sep 2017 16:00351
22 Sep 2017 17:00315
22 Sep 2017 18:00324
22 Sep 2017 19:00301
22 Sep 2017 20:00307
22 Sep 2017 21:00300
22 Sep 2017 22:00300
22 Sep 2017 23:00308
23 Sep 2017 00:00317
23 Sep 2017 01:00309
23 Sep 2017 02:00313
23 Sep 2017 03:00311
23 Sep 2017 04:00310
23 Sep 2017 05:00307
23 Sep 2017 06:00307
23 Sep 2017 07:00305
23 Sep 2017 08:00315
23 Sep 2017 09:00316
23 Sep 2017 10:00313
23 Sep 2017 11:00309
23 Sep 2017 12:00310
23 Sep 2017 13:00328
23 Sep 2017 14:00334
23 Sep 2017 15:00319
23 Sep 2017 16:00321
23 Sep 2017 17:00314
23 Sep 2017 18:00325
23 Sep 2017 19:00320
23 Sep 2017 20:00319
23 Sep 2017 21:00304
23 Sep 2017 22:00307
23 Sep 2017 23:00309

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits409900514
Misses4291075

Availability

Total downtime, according to Pingdom:

Last 30 daysa minute
Last 3 monthsa minute
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.