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
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
22 Jan 2018 00:00127463711
23 Jan 2018 00:00128251542
24 Jan 2018 00:00129418632
25 Jan 2018 00:00126867522
26 Jan 2018 00:00120384169
27 Jan 2018 00:00107965025
28 Jan 2018 00:00115270802
29 Jan 2018 00:00130355607
30 Jan 2018 00:00130555501
31 Jan 2018 00:00129498048
1 Feb 2018 00:00126605496
2 Feb 2018 00:00123983716
3 Feb 2018 00:00111065036
4 Feb 2018 00:00115819500
5 Feb 2018 00:00132442241
6 Feb 2018 00:00136758552
7 Feb 2018 00:00139067668
8 Feb 2018 00:00139124509
9 Feb 2018 00:00134354204
10 Feb 2018 00:00121145171
11 Feb 2018 00:00127889728
12 Feb 2018 00:00140596687
13 Feb 2018 00:00138263086
14 Feb 2018 00:00138212012
15 Feb 2018 00:00136768187
16 Feb 2018 00:00128170459
17 Feb 2018 00:00125968624
18 Feb 2018 00:00146589060
19 Feb 2018 00:00165903663
20 Feb 2018 00:00167525854
21 Feb 2018 00:00158916018
22 Feb 2018 00:00160879043
23 Feb 2018 00:00141576752
24 Feb 2018 00:00126713076
25 Feb 2018 00:00134883238
26 Feb 2018 00:00148826217
27 Feb 2018 00:00146355757
28 Feb 2018 00:00145228059
1 Mar 2018 00:00143446723
2 Mar 2018 00:00137850813
3 Mar 2018 00:00118868541
4 Mar 2018 00:00126467406
5 Mar 2018 00:00146264015
6 Mar 2018 00:00147668608
7 Mar 2018 00:00144228367
8 Mar 2018 00:00138996984
9 Mar 2018 00:00132861473
10 Mar 2018 00:00121317330
11 Mar 2018 00:00131218955
12 Mar 2018 00:00150260778
13 Mar 2018 00:00147995408
14 Mar 2018 00:00151339807
15 Mar 2018 00:00142475638
16 Mar 2018 00:00132398933
17 Mar 2018 00:00120790249
18 Mar 2018 00:00129563559
19 Mar 2018 00:00148971127
20 Mar 2018 00:00152870962
21 Mar 2018 00:00152410152
22 Mar 2018 00:00145527066
23 Mar 2018 00:00137957494
24 Mar 2018 00:00122772704
25 Mar 2018 00:00124787041
26 Mar 2018 00:00141243768
27 Mar 2018 00:00141244426
28 Mar 2018 00:00136539804
29 Mar 2018 00:00131857731
30 Mar 2018 00:00124484637
31 Mar 2018 00:00118672916
1 Apr 2018 00:00118417810
2 Apr 2018 00:00138034449
3 Apr 2018 00:00148032892
4 Apr 2018 00:00146099052
5 Apr 2018 00:00141986002
6 Apr 2018 00:00135585696
7 Apr 2018 00:00122905451
8 Apr 2018 00:00127860716
9 Apr 2018 00:00151467598
10 Apr 2018 00:00151332754
11 Apr 2018 00:00160644016
12 Apr 2018 00:00163440372
13 Apr 2018 00:00151041716
14 Apr 2018 00:00134732919
15 Apr 2018 00:00139639882
16 Apr 2018 00:00156225246
17 Apr 2018 00:00151183375
18 Apr 2018 00:00148817465

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
12 Apr 2018 21:00319
12 Apr 2018 22:00311
12 Apr 2018 23:00305
13 Apr 2018 00:00313
13 Apr 2018 01:00305
13 Apr 2018 02:00323
13 Apr 2018 03:00315
13 Apr 2018 04:00313
13 Apr 2018 05:00304
13 Apr 2018 06:00316
13 Apr 2018 07:00305
13 Apr 2018 08:00308
13 Apr 2018 09:00335
13 Apr 2018 10:00317
13 Apr 2018 11:00308
13 Apr 2018 12:00308
13 Apr 2018 13:00324
13 Apr 2018 14:00318
13 Apr 2018 15:00315
13 Apr 2018 16:00316
13 Apr 2018 17:00309
13 Apr 2018 18:00313
13 Apr 2018 19:00299
13 Apr 2018 20:00318
13 Apr 2018 21:00307
13 Apr 2018 22:00309
13 Apr 2018 23:00309
14 Apr 2018 00:00310
14 Apr 2018 01:00312
14 Apr 2018 02:00306
14 Apr 2018 03:00309
14 Apr 2018 04:00306
14 Apr 2018 05:00308
14 Apr 2018 06:00299
14 Apr 2018 07:00322
14 Apr 2018 08:00324
14 Apr 2018 09:00309
14 Apr 2018 10:00302
14 Apr 2018 11:00306
14 Apr 2018 12:00320
14 Apr 2018 13:00300
14 Apr 2018 14:00330
14 Apr 2018 15:00330
14 Apr 2018 16:00352
14 Apr 2018 17:00360
14 Apr 2018 18:00343
14 Apr 2018 19:00322
14 Apr 2018 20:00325
14 Apr 2018 21:00339
14 Apr 2018 22:00310
14 Apr 2018 23:00313
15 Apr 2018 00:00312
15 Apr 2018 01:00304
15 Apr 2018 02:00321
15 Apr 2018 03:00323
15 Apr 2018 04:00301
15 Apr 2018 05:00331
15 Apr 2018 06:00327
15 Apr 2018 07:00310
15 Apr 2018 08:00323
15 Apr 2018 09:00329
15 Apr 2018 10:00322
15 Apr 2018 11:00311
15 Apr 2018 12:00327
15 Apr 2018 13:00356
15 Apr 2018 14:00363
15 Apr 2018 15:00352
15 Apr 2018 16:00355
15 Apr 2018 17:00357
15 Apr 2018 18:00348
15 Apr 2018 19:00353
15 Apr 2018 20:00364
15 Apr 2018 21:00354
15 Apr 2018 22:00359
15 Apr 2018 23:00361
16 Apr 2018 00:00359
16 Apr 2018 01:00350
16 Apr 2018 02:00354
16 Apr 2018 03:00321
16 Apr 2018 04:00323
16 Apr 2018 05:00325
16 Apr 2018 06:00297
16 Apr 2018 07:00293
16 Apr 2018 08:00291
16 Apr 2018 09:00293
16 Apr 2018 10:00290
16 Apr 2018 11:00283
16 Apr 2018 12:00306
16 Apr 2018 13:00297
16 Apr 2018 14:00295
16 Apr 2018 15:00285
16 Apr 2018 16:00283
16 Apr 2018 17:00296
16 Apr 2018 18:00293
16 Apr 2018 19:00296
16 Apr 2018 20:00288
16 Apr 2018 21:00288
16 Apr 2018 22:00293
16 Apr 2018 23:00296
17 Apr 2018 00:00279
17 Apr 2018 01:00305
17 Apr 2018 02:00302
17 Apr 2018 03:00305
17 Apr 2018 04:00304
17 Apr 2018 05:00315
17 Apr 2018 06:00307
17 Apr 2018 07:00303
17 Apr 2018 08:00312
17 Apr 2018 09:00313
17 Apr 2018 10:00307
17 Apr 2018 11:00316
17 Apr 2018 12:00318
17 Apr 2018 13:00324
17 Apr 2018 14:00320
17 Apr 2018 15:00324
17 Apr 2018 16:00327
17 Apr 2018 17:00307
17 Apr 2018 18:00322
17 Apr 2018 19:00313
17 Apr 2018 20:00309
17 Apr 2018 21:00317
17 Apr 2018 22:00320
17 Apr 2018 23:00315
18 Apr 2018 00:00316
18 Apr 2018 01:00314
18 Apr 2018 02:00306
18 Apr 2018 03:00315
18 Apr 2018 04:00315
18 Apr 2018 05:00312
18 Apr 2018 06:00303
18 Apr 2018 07:00311
18 Apr 2018 08:00309
18 Apr 2018 09:00303
18 Apr 2018 10:00303
18 Apr 2018 11:00308
18 Apr 2018 12:00309
18 Apr 2018 13:00308
18 Apr 2018 14:00307
18 Apr 2018 15:00329
18 Apr 2018 16:00302
18 Apr 2018 17:00315
18 Apr 2018 18:00313
18 Apr 2018 19:00301
18 Apr 2018 20:00305
18 Apr 2018 21:00294
18 Apr 2018 22:00306
18 Apr 2018 23:00330
19 Apr 2018 00:00302
19 Apr 2018 01:00295
19 Apr 2018 02:00307
19 Apr 2018 03:00291
19 Apr 2018 04:00304
19 Apr 2018 05:00300
19 Apr 2018 06:00299
19 Apr 2018 07:00310
19 Apr 2018 08:00300
19 Apr 2018 09:00305
19 Apr 2018 10:00304
19 Apr 2018 11:00302
19 Apr 2018 12:00301
19 Apr 2018 13:00307
19 Apr 2018 14:00310
19 Apr 2018 15:00316
19 Apr 2018 16:00427
19 Apr 2018 17:00304
19 Apr 2018 18:00296
19 Apr 2018 19:00296
19 Apr 2018 20:00290
19 Apr 2018 21:00354

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1024742635
Misses5941500

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 monthsNone
Last 12 months4 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.