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 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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
15 Feb 2018 19:00392
15 Feb 2018 20:00415
15 Feb 2018 21:00422
15 Feb 2018 22:00448
15 Feb 2018 23:00423
16 Feb 2018 00:00418
16 Feb 2018 01:00401
16 Feb 2018 02:00386
16 Feb 2018 03:00389
16 Feb 2018 04:00383
16 Feb 2018 05:00393
16 Feb 2018 06:00402
16 Feb 2018 07:00384
16 Feb 2018 08:00393
16 Feb 2018 09:00416
16 Feb 2018 10:00378
16 Feb 2018 11:00391
16 Feb 2018 12:00389
16 Feb 2018 13:00398
16 Feb 2018 14:00393
16 Feb 2018 15:00394
16 Feb 2018 16:00397
16 Feb 2018 17:00415
16 Feb 2018 18:00404
16 Feb 2018 19:00389
16 Feb 2018 20:00404
16 Feb 2018 21:00419
16 Feb 2018 22:00423
16 Feb 2018 23:00430
17 Feb 2018 00:00398
17 Feb 2018 01:00375
17 Feb 2018 02:00372
17 Feb 2018 03:00397
17 Feb 2018 04:00381
17 Feb 2018 05:00373
17 Feb 2018 06:00374
17 Feb 2018 07:00383
17 Feb 2018 08:00402
17 Feb 2018 09:00421
17 Feb 2018 10:00436
17 Feb 2018 11:00419
17 Feb 2018 12:00425
17 Feb 2018 13:00410
17 Feb 2018 14:00423
17 Feb 2018 15:00439
17 Feb 2018 16:00423
17 Feb 2018 17:00424
17 Feb 2018 18:00434
17 Feb 2018 19:00430
17 Feb 2018 20:00422
17 Feb 2018 21:00419
17 Feb 2018 22:00420
17 Feb 2018 23:00414
18 Feb 2018 00:00404
18 Feb 2018 01:00397
18 Feb 2018 02:00383
18 Feb 2018 03:00388
18 Feb 2018 04:00379
18 Feb 2018 05:00376
18 Feb 2018 06:00392
18 Feb 2018 07:00396
18 Feb 2018 08:00409
18 Feb 2018 09:00429
18 Feb 2018 10:00419
18 Feb 2018 11:00412
18 Feb 2018 12:00405
18 Feb 2018 13:00431
18 Feb 2018 14:00422
18 Feb 2018 15:00415
18 Feb 2018 16:00433
18 Feb 2018 17:00426
18 Feb 2018 18:00430
18 Feb 2018 19:00412
18 Feb 2018 20:00412
18 Feb 2018 21:00579
18 Feb 2018 22:00394
18 Feb 2018 23:00386
19 Feb 2018 00:00391
19 Feb 2018 01:00382
19 Feb 2018 02:00390
19 Feb 2018 03:00369
19 Feb 2018 04:00383
19 Feb 2018 05:00378
19 Feb 2018 06:00386
19 Feb 2018 07:00397
19 Feb 2018 08:00400
19 Feb 2018 09:00412
19 Feb 2018 10:00406
19 Feb 2018 11:00395
19 Feb 2018 12:00398
19 Feb 2018 13:00402
19 Feb 2018 14:00417
19 Feb 2018 15:00407
19 Feb 2018 16:00446
19 Feb 2018 17:00420
19 Feb 2018 18:00416
19 Feb 2018 19:00408
19 Feb 2018 20:00433
19 Feb 2018 21:00401
19 Feb 2018 22:00384
19 Feb 2018 23:00387
20 Feb 2018 00:00398
20 Feb 2018 01:00377
20 Feb 2018 02:00371
20 Feb 2018 03:00366
20 Feb 2018 04:00361
20 Feb 2018 05:00369
20 Feb 2018 06:00364
20 Feb 2018 07:00390
20 Feb 2018 08:00417
20 Feb 2018 09:00384
20 Feb 2018 10:00408
20 Feb 2018 11:00412
20 Feb 2018 12:00405
20 Feb 2018 13:00401
20 Feb 2018 14:00418
20 Feb 2018 15:00415
20 Feb 2018 16:00410
20 Feb 2018 17:00439
20 Feb 2018 18:00430
20 Feb 2018 19:00448
20 Feb 2018 20:00432
20 Feb 2018 21:00416
20 Feb 2018 22:00381
20 Feb 2018 23:00386
21 Feb 2018 00:00379
21 Feb 2018 01:00375
21 Feb 2018 02:00367
21 Feb 2018 03:00392
21 Feb 2018 04:00370
21 Feb 2018 05:00376
21 Feb 2018 06:00403
21 Feb 2018 07:00399
21 Feb 2018 08:00382
21 Feb 2018 09:00375
21 Feb 2018 10:00401
21 Feb 2018 11:00394
21 Feb 2018 12:00398
21 Feb 2018 13:00414
21 Feb 2018 14:00399
21 Feb 2018 15:00414
21 Feb 2018 16:00604
21 Feb 2018 17:00412
21 Feb 2018 18:00440
21 Feb 2018 19:00480
21 Feb 2018 20:00441
21 Feb 2018 21:00448
21 Feb 2018 22:00427
21 Feb 2018 23:00420
22 Feb 2018 00:00392
22 Feb 2018 01:00380
22 Feb 2018 02:00361
22 Feb 2018 03:00373
22 Feb 2018 04:00377
22 Feb 2018 05:00382
22 Feb 2018 06:00390
22 Feb 2018 07:00405
22 Feb 2018 08:00408
22 Feb 2018 09:00413
22 Feb 2018 10:00404
22 Feb 2018 11:00411
22 Feb 2018 12:00428
22 Feb 2018 13:00474
22 Feb 2018 14:00470
22 Feb 2018 15:00450
22 Feb 2018 16:00445
22 Feb 2018 17:00476
22 Feb 2018 18:00586
22 Feb 2018 19:00691

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits980188441
Misses31604722

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.