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 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
19 Apr 2018 00:00146308222
20 Apr 2018 00:00139677430
21 Apr 2018 00:00123019769
22 Apr 2018 00:00131496908
23 Apr 2018 00:00156090595
24 Apr 2018 00:00152817875
25 Apr 2018 00:00150432183
26 Apr 2018 00:00150547064
27 Apr 2018 00:00141807612
28 Apr 2018 00:00123117710
29 Apr 2018 00:00130439531
30 Apr 2018 00:00144954317
1 May 2018 00:00145063226
2 May 2018 00:00147623385
3 May 2018 00:00149955772
4 May 2018 00:00141585862
5 May 2018 00:00124752955
6 May 2018 00:00130877359
7 May 2018 00:00150216255
8 May 2018 00:00156877546
9 May 2018 00:00155051710
10 May 2018 00:00154415832
11 May 2018 00:00149430166
12 May 2018 00:00134464778
13 May 2018 00:00136456486
14 May 2018 00:00157916424
15 May 2018 00:00157929677
16 May 2018 00:00157379713
17 May 2018 00:00155134962
18 May 2018 00:00152377521
19 May 2018 00:00133951065
20 May 2018 00:00137994270
21 May 2018 00:00165035112
22 May 2018 00:00166944315
23 May 2018 00:00159229249
24 May 2018 00:00156842458
25 May 2018 00:00149078645
26 May 2018 00:00130041983

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
20 May 2018 21:00340
20 May 2018 22:00345
20 May 2018 23:00346
21 May 2018 00:00337
21 May 2018 01:00347
21 May 2018 02:00339
21 May 2018 03:00340
21 May 2018 04:00341
21 May 2018 05:00331
21 May 2018 06:00357
21 May 2018 07:00355
21 May 2018 08:00339
21 May 2018 09:00338
21 May 2018 10:00333
21 May 2018 11:00336
21 May 2018 12:00404
21 May 2018 13:00393
21 May 2018 14:00351
21 May 2018 15:00329
21 May 2018 16:00346
21 May 2018 17:00340
21 May 2018 18:00334
21 May 2018 19:00344
21 May 2018 20:00347
21 May 2018 21:00348
21 May 2018 22:00437
21 May 2018 23:00339
22 May 2018 00:00356
22 May 2018 01:00367
22 May 2018 02:00371
22 May 2018 03:00367
22 May 2018 04:00372
22 May 2018 05:00362
22 May 2018 06:00378
22 May 2018 07:00359
22 May 2018 08:00358
22 May 2018 09:00388
22 May 2018 10:00357
22 May 2018 11:00362
22 May 2018 12:00431
22 May 2018 13:00389
22 May 2018 14:00363
22 May 2018 15:00368
22 May 2018 16:00362
22 May 2018 17:00360
22 May 2018 18:00364
22 May 2018 19:00366
22 May 2018 20:00359
22 May 2018 21:00364
22 May 2018 22:00358
22 May 2018 23:00358
23 May 2018 00:00363
23 May 2018 01:00359
23 May 2018 02:00359
23 May 2018 03:00378
23 May 2018 04:00375
23 May 2018 05:00356
23 May 2018 06:00375
23 May 2018 07:00367
23 May 2018 08:00371
23 May 2018 09:00364
23 May 2018 10:00370
23 May 2018 11:00377
23 May 2018 12:00370
23 May 2018 13:00364
23 May 2018 14:00365
23 May 2018 15:00368
23 May 2018 16:00378
23 May 2018 17:00373
23 May 2018 18:00392
23 May 2018 19:00368
23 May 2018 20:00361
23 May 2018 21:00370
23 May 2018 22:00367
23 May 2018 23:00361
24 May 2018 00:00342
24 May 2018 01:00362
24 May 2018 02:00374
24 May 2018 03:00420
24 May 2018 04:00330
24 May 2018 05:00345
24 May 2018 06:00333
24 May 2018 07:00332
24 May 2018 08:00336
24 May 2018 09:00330
24 May 2018 10:00332
24 May 2018 11:00345
24 May 2018 12:00317
24 May 2018 13:00313
24 May 2018 14:00315
24 May 2018 15:00334
24 May 2018 16:00377
24 May 2018 17:00342
24 May 2018 18:00323
24 May 2018 19:00310
24 May 2018 20:00317
24 May 2018 21:00320
24 May 2018 22:00321
24 May 2018 23:00318
25 May 2018 00:00314
25 May 2018 01:00320
25 May 2018 02:00340
25 May 2018 03:00319
25 May 2018 04:00315
25 May 2018 05:00309
25 May 2018 06:00311
25 May 2018 07:00288
25 May 2018 08:00291
25 May 2018 09:00284
25 May 2018 10:00286
25 May 2018 11:00291
25 May 2018 12:00284
25 May 2018 13:00279
25 May 2018 14:00288
25 May 2018 15:00288
25 May 2018 16:00282
25 May 2018 17:00298
25 May 2018 18:00284
25 May 2018 19:00292
25 May 2018 20:00286
25 May 2018 21:00285
25 May 2018 22:00285
25 May 2018 23:00278
26 May 2018 00:00297
26 May 2018 01:00291
26 May 2018 02:00277
26 May 2018 03:00286
26 May 2018 04:00282
26 May 2018 05:00283
26 May 2018 06:00288
26 May 2018 07:00292
26 May 2018 08:00276
26 May 2018 09:00286
26 May 2018 10:00282
26 May 2018 11:00279
26 May 2018 12:00282
26 May 2018 13:00286
26 May 2018 14:00302
26 May 2018 15:00284
26 May 2018 16:00287
26 May 2018 17:00282
26 May 2018 18:00297
26 May 2018 19:00285
26 May 2018 20:00282
26 May 2018 21:00277
26 May 2018 22:00288
26 May 2018 23:00287
27 May 2018 00:00285
27 May 2018 01:00282
27 May 2018 02:00291
27 May 2018 03:00289
27 May 2018 04:00291
27 May 2018 05:00292
27 May 2018 06:00293
27 May 2018 07:00298
27 May 2018 08:00289
27 May 2018 09:00296
27 May 2018 10:00299
27 May 2018 11:00286
27 May 2018 12:00296
27 May 2018 13:00298
27 May 2018 14:00306
27 May 2018 15:00308
27 May 2018 16:00305
27 May 2018 17:00302
27 May 2018 18:00293
27 May 2018 19:00293
27 May 2018 20:00296
27 May 2018 21:00310

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1045388457
Misses6678770

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.