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 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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
14 Oct 2017 05:00351
14 Oct 2017 06:00347
14 Oct 2017 07:00346
14 Oct 2017 08:00352
14 Oct 2017 09:00345
14 Oct 2017 10:00359
14 Oct 2017 11:00358
14 Oct 2017 12:00351
14 Oct 2017 13:00367
14 Oct 2017 14:00359
14 Oct 2017 15:00353
14 Oct 2017 16:00366
14 Oct 2017 17:00355
14 Oct 2017 18:00368
14 Oct 2017 19:00348
14 Oct 2017 20:00357
14 Oct 2017 21:00350
14 Oct 2017 22:00387
14 Oct 2017 23:00358
15 Oct 2017 00:00343
15 Oct 2017 01:00355
15 Oct 2017 02:00360
15 Oct 2017 03:00370
15 Oct 2017 04:00361
15 Oct 2017 05:00361
15 Oct 2017 06:00351
15 Oct 2017 07:00360
15 Oct 2017 08:00354
15 Oct 2017 09:00359
15 Oct 2017 10:00354
15 Oct 2017 11:00343
15 Oct 2017 12:00335
15 Oct 2017 13:00339
15 Oct 2017 14:00338
15 Oct 2017 15:00340
15 Oct 2017 16:00336
15 Oct 2017 17:00341
15 Oct 2017 18:00340
15 Oct 2017 19:00365
15 Oct 2017 20:00353
15 Oct 2017 21:00356
15 Oct 2017 22:00348
15 Oct 2017 23:00354
16 Oct 2017 00:00352
16 Oct 2017 01:00340
16 Oct 2017 02:00348
16 Oct 2017 03:00365
16 Oct 2017 04:00344
16 Oct 2017 05:00353
16 Oct 2017 06:00404
16 Oct 2017 07:00419
16 Oct 2017 08:00424
16 Oct 2017 09:00414
16 Oct 2017 10:00424
16 Oct 2017 11:00417
16 Oct 2017 12:00434
16 Oct 2017 13:00429
16 Oct 2017 14:00426
16 Oct 2017 15:00431
16 Oct 2017 16:00431
16 Oct 2017 17:00411
16 Oct 2017 18:00433
16 Oct 2017 19:00435
16 Oct 2017 20:001883
16 Oct 2017 21:001451
16 Oct 2017 22:00416
16 Oct 2017 23:00694
17 Oct 2017 00:00415
17 Oct 2017 01:00425
17 Oct 2017 02:00421
17 Oct 2017 03:00414
17 Oct 2017 04:00425
17 Oct 2017 05:00428
17 Oct 2017 06:00437
17 Oct 2017 07:00417
17 Oct 2017 08:00430
17 Oct 2017 09:00409
17 Oct 2017 10:00422
17 Oct 2017 11:00437
17 Oct 2017 12:00427
17 Oct 2017 13:00421
17 Oct 2017 14:00419
17 Oct 2017 15:00418
17 Oct 2017 16:00503
17 Oct 2017 17:00415
17 Oct 2017 18:00434
17 Oct 2017 19:00448
17 Oct 2017 20:00436
17 Oct 2017 21:00420
17 Oct 2017 22:00427
17 Oct 2017 23:00440
18 Oct 2017 00:00427
18 Oct 2017 01:00426
18 Oct 2017 02:00424
18 Oct 2017 03:00429
18 Oct 2017 04:00440
18 Oct 2017 05:00467
18 Oct 2017 06:00450
18 Oct 2017 07:00456
18 Oct 2017 08:00459
18 Oct 2017 09:00463
18 Oct 2017 10:00468
18 Oct 2017 11:00456
18 Oct 2017 12:00460
18 Oct 2017 13:00486
18 Oct 2017 14:00465
18 Oct 2017 15:00473
18 Oct 2017 16:00444
18 Oct 2017 17:00447
18 Oct 2017 18:00455
18 Oct 2017 19:00474
18 Oct 2017 20:00438
18 Oct 2017 21:00424
18 Oct 2017 22:00421
18 Oct 2017 23:00426
19 Oct 2017 00:00420
19 Oct 2017 01:00436
19 Oct 2017 02:00432
19 Oct 2017 03:00511
19 Oct 2017 04:00436
19 Oct 2017 05:00456
19 Oct 2017 06:00426
19 Oct 2017 07:00395
19 Oct 2017 08:00398
19 Oct 2017 09:00380
19 Oct 2017 10:00430
19 Oct 2017 11:00376
19 Oct 2017 12:00384
19 Oct 2017 13:00400
19 Oct 2017 14:00382
19 Oct 2017 15:00381
19 Oct 2017 16:00378
19 Oct 2017 17:00371
19 Oct 2017 18:00393
19 Oct 2017 19:00375
19 Oct 2017 20:00388
19 Oct 2017 21:00371
19 Oct 2017 22:00382
19 Oct 2017 23:00372
20 Oct 2017 00:00366
20 Oct 2017 01:00394
20 Oct 2017 02:00370
20 Oct 2017 03:00359
20 Oct 2017 04:00379
20 Oct 2017 05:00358
20 Oct 2017 06:00357
20 Oct 2017 07:00357
20 Oct 2017 08:00375
20 Oct 2017 09:00364
20 Oct 2017 10:00387
20 Oct 2017 11:00364
20 Oct 2017 12:00380
20 Oct 2017 13:00377
20 Oct 2017 14:00394
20 Oct 2017 15:00363
20 Oct 2017 16:00371
20 Oct 2017 17:00365
20 Oct 2017 18:00382
20 Oct 2017 19:00349
20 Oct 2017 20:00340
20 Oct 2017 21:00305
20 Oct 2017 22:00317
20 Oct 2017 23:00315
21 Oct 2017 00:00314
21 Oct 2017 01:00336
21 Oct 2017 02:00324
21 Oct 2017 03:00288
21 Oct 2017 04:00266
21 Oct 2017 05:00572

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits517521722
Misses5462355

Availability

Total downtime, according to Pingdom:

Last 30 daysa few seconds
Last 3 months2 minutes
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.