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
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
20 Nov 2017 00:0099052021
21 Nov 2017 00:0099716291
22 Nov 2017 00:0097635801
23 Nov 2017 00:0090341565
24 Nov 2017 00:0092040324
25 Nov 2017 00:0079964859
26 Nov 2017 00:0084816649
27 Nov 2017 00:00101486210
28 Nov 2017 00:00100666034
29 Nov 2017 00:0097726788
30 Nov 2017 00:0094081247
1 Dec 2017 00:0087722155
2 Dec 2017 00:0076908680
3 Dec 2017 00:0082275848
4 Dec 2017 00:0099230121
5 Dec 2017 00:00104305530
6 Dec 2017 00:00113489163
7 Dec 2017 00:00113935626
8 Dec 2017 00:00114228153
9 Dec 2017 00:00103803188
10 Dec 2017 00:00105394307
11 Dec 2017 00:00120647312
12 Dec 2017 00:00117954110
13 Dec 2017 00:00116247778
14 Dec 2017 00:00114074881
15 Dec 2017 00:00109037266
16 Dec 2017 00:0096742577
17 Dec 2017 00:00101537515
18 Dec 2017 00:00115547310
19 Dec 2017 00:00111821552
20 Dec 2017 00:00107573932
21 Dec 2017 00:00106008942
22 Dec 2017 00:0098104419
23 Dec 2017 00:0089353103
24 Dec 2017 00:0083112468
25 Dec 2017 00:0084156503
26 Dec 2017 00:00102034171
27 Dec 2017 00:00108476681
28 Dec 2017 00:00103829254
29 Dec 2017 00:0097626769
30 Dec 2017 00:0091782161
31 Dec 2017 00:0083261386
1 Jan 2018 00:0087187157
2 Jan 2018 00:00108412950
3 Jan 2018 00:00118534439
4 Jan 2018 00:00128923485
5 Jan 2018 00:00124652459
6 Jan 2018 00:00114002907
7 Jan 2018 00:00118316648
8 Jan 2018 00:00132189702
9 Jan 2018 00:00130867281
10 Jan 2018 00:00127827186
11 Jan 2018 00:00127411927
12 Jan 2018 00:00121884686
13 Jan 2018 00:00108305737
14 Jan 2018 00:00113701395
15 Jan 2018 00:00129564506
16 Jan 2018 00:00134840813
17 Jan 2018 00:00130145641
18 Jan 2018 00:00126168580
19 Jan 2018 00:00117482014
20 Jan 2018 00:00105049679
21 Jan 2018 00:00112963724

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
15 Jan 2018 02:00328
15 Jan 2018 03:00317
15 Jan 2018 04:00328
15 Jan 2018 05:00335
15 Jan 2018 06:00329
15 Jan 2018 07:00328
15 Jan 2018 08:00321
15 Jan 2018 09:00426
15 Jan 2018 10:00408
15 Jan 2018 11:00315
15 Jan 2018 12:00326
15 Jan 2018 13:00325
15 Jan 2018 14:00320
15 Jan 2018 15:00329
15 Jan 2018 16:00325
15 Jan 2018 17:00346
15 Jan 2018 18:00343
15 Jan 2018 19:00345
15 Jan 2018 20:00328
15 Jan 2018 21:00323
15 Jan 2018 22:00343
15 Jan 2018 23:00350
16 Jan 2018 00:00325
16 Jan 2018 01:00338
16 Jan 2018 02:00334
16 Jan 2018 03:00331
16 Jan 2018 04:00331
16 Jan 2018 05:00331
16 Jan 2018 06:00329
16 Jan 2018 07:00345
16 Jan 2018 08:00332
16 Jan 2018 09:00331
16 Jan 2018 10:00326
16 Jan 2018 11:00336
16 Jan 2018 12:00335
16 Jan 2018 13:00346
16 Jan 2018 14:00336
16 Jan 2018 15:00329
16 Jan 2018 16:00328
16 Jan 2018 17:00343
16 Jan 2018 18:00334
16 Jan 2018 19:00335
16 Jan 2018 20:00344
16 Jan 2018 21:00335
16 Jan 2018 22:00343
16 Jan 2018 23:00328
17 Jan 2018 00:00344
17 Jan 2018 01:00333
17 Jan 2018 02:00347
17 Jan 2018 03:00334
17 Jan 2018 04:00329
17 Jan 2018 05:00329
17 Jan 2018 06:00338
17 Jan 2018 07:00322
17 Jan 2018 08:00325
17 Jan 2018 09:00325
17 Jan 2018 10:00333
17 Jan 2018 11:00346
17 Jan 2018 12:00337
17 Jan 2018 13:00329
17 Jan 2018 14:00328
17 Jan 2018 15:00319
17 Jan 2018 16:00321
17 Jan 2018 17:00328
17 Jan 2018 18:00319
17 Jan 2018 19:00326
17 Jan 2018 20:00321
17 Jan 2018 21:00327
17 Jan 2018 22:00339
17 Jan 2018 23:00317
18 Jan 2018 00:00315
18 Jan 2018 01:00329
18 Jan 2018 02:00322
18 Jan 2018 03:00330
18 Jan 2018 04:00324
18 Jan 2018 05:00331
18 Jan 2018 06:00326
18 Jan 2018 07:00330
18 Jan 2018 08:00326
18 Jan 2018 09:00330
18 Jan 2018 10:00338
18 Jan 2018 11:00330
18 Jan 2018 12:00319
18 Jan 2018 13:00334
18 Jan 2018 14:00331
18 Jan 2018 15:00332
18 Jan 2018 16:00336
18 Jan 2018 17:00315
18 Jan 2018 18:00304
18 Jan 2018 19:00310
18 Jan 2018 20:00329
18 Jan 2018 21:00318
18 Jan 2018 22:00315
18 Jan 2018 23:00308
19 Jan 2018 00:00298
19 Jan 2018 01:00307
19 Jan 2018 02:00314
19 Jan 2018 03:00305
19 Jan 2018 04:00319
19 Jan 2018 05:00299
19 Jan 2018 06:00301
19 Jan 2018 07:00316
19 Jan 2018 08:00319
19 Jan 2018 09:00306
19 Jan 2018 10:00297
19 Jan 2018 11:00304
19 Jan 2018 12:00306
19 Jan 2018 13:00304
19 Jan 2018 14:00301
19 Jan 2018 15:00322
19 Jan 2018 16:00308
19 Jan 2018 17:00312
19 Jan 2018 18:00325
19 Jan 2018 19:00308
19 Jan 2018 20:00321
19 Jan 2018 21:00305
19 Jan 2018 22:00313
19 Jan 2018 23:00301
20 Jan 2018 00:00312
20 Jan 2018 01:00309
20 Jan 2018 02:00344
20 Jan 2018 03:00407
20 Jan 2018 04:00353
20 Jan 2018 05:00301
20 Jan 2018 06:00308
20 Jan 2018 07:00300
20 Jan 2018 08:00300
20 Jan 2018 09:00303
20 Jan 2018 10:00299
20 Jan 2018 11:00308
20 Jan 2018 12:00303
20 Jan 2018 13:00291
20 Jan 2018 14:00302
20 Jan 2018 15:00326
20 Jan 2018 16:00307
20 Jan 2018 17:00346
20 Jan 2018 18:00315
20 Jan 2018 19:00317
20 Jan 2018 20:00303
20 Jan 2018 21:00303
20 Jan 2018 22:00303
20 Jan 2018 23:00299
21 Jan 2018 00:00304
21 Jan 2018 01:00319
21 Jan 2018 02:00300
21 Jan 2018 03:00305
21 Jan 2018 04:00312
21 Jan 2018 05:00504
21 Jan 2018 06:00304
21 Jan 2018 07:00315
21 Jan 2018 08:00301
21 Jan 2018 09:00310
21 Jan 2018 10:00303
21 Jan 2018 11:00301
21 Jan 2018 12:00301
21 Jan 2018 13:00311
21 Jan 2018 14:00305
21 Jan 2018 15:00315
21 Jan 2018 16:00324
21 Jan 2018 17:00303
21 Jan 2018 18:00307
21 Jan 2018 19:00310
21 Jan 2018 20:00312
21 Jan 2018 21:00307
21 Jan 2018 22:00304
21 Jan 2018 23:00300
22 Jan 2018 00:00315
22 Jan 2018 01:00309
22 Jan 2018 02:00319

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits834491630
Misses7779631

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 months2 minutes
Last 12 months22 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.