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
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
27 May 2018 00:00137201713
28 May 2018 00:00151111740
29 May 2018 00:00159625387
30 May 2018 00:00158094653
31 May 2018 00:00152676185
1 Jun 2018 00:00145799672
2 Jun 2018 00:00128003131
3 Jun 2018 00:00133898321
4 Jun 2018 00:00158271831
5 Jun 2018 00:00155866270
6 Jun 2018 00:00157134911
7 Jun 2018 00:00157046516
8 Jun 2018 00:00158317679
9 Jun 2018 00:00132795575
10 Jun 2018 00:00137701498
11 Jun 2018 00:00157067783
12 Jun 2018 00:00159855942
13 Jun 2018 00:00165271063
14 Jun 2018 00:00166830595
15 Jun 2018 00:00158138214
16 Jun 2018 00:00139427587
17 Jun 2018 00:00140448820
18 Jun 2018 00:00164782063
19 Jun 2018 00:00171848789
20 Jun 2018 00:00166979695
21 Jun 2018 00:00171977054
22 Jun 2018 00:00168506443
23 Jun 2018 00:00153190235
24 Jun 2018 00:00160545530
25 Jun 2018 00:00182843257
26 Jun 2018 00:00182426044
27 Jun 2018 00:00181164977
28 Jun 2018 00:00176305022
29 Jun 2018 00:00163837913
30 Jun 2018 00:00150846821
1 Jul 2018 00:00162253380
2 Jul 2018 00:00183525485
3 Jul 2018 00:00185924891
4 Jul 2018 00:00181990863
5 Jul 2018 00:00180577649
6 Jul 2018 00:00180386356
7 Jul 2018 00:00163451702
8 Jul 2018 00:00176187228
9 Jul 2018 00:00200173511
10 Jul 2018 00:00204465755
11 Jul 2018 00:00201999610
12 Jul 2018 00:00188539430
13 Jul 2018 00:00184594395
14 Jul 2018 00:00156025490
15 Jul 2018 00:00158302187
16 Jul 2018 00:00199905068
17 Jul 2018 00:00203597202
18 Jul 2018 00:00191886503
19 Jul 2018 00:00186405937
20 Jul 2018 00:00179289455

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
14 Jul 2018 21:00396
14 Jul 2018 22:00395
14 Jul 2018 23:00395
15 Jul 2018 00:00392
15 Jul 2018 01:00389
15 Jul 2018 02:00387
15 Jul 2018 03:00399
15 Jul 2018 04:00397
15 Jul 2018 05:00389
15 Jul 2018 06:00397
15 Jul 2018 07:00390
15 Jul 2018 08:00389
15 Jul 2018 09:00389
15 Jul 2018 10:00401
15 Jul 2018 11:00397
15 Jul 2018 12:00400
15 Jul 2018 13:00386
15 Jul 2018 14:00389
15 Jul 2018 15:00404
15 Jul 2018 16:00392
15 Jul 2018 17:00395
15 Jul 2018 18:00414
15 Jul 2018 19:00419
15 Jul 2018 20:00393
15 Jul 2018 21:00399
15 Jul 2018 22:00390
15 Jul 2018 23:00394
16 Jul 2018 00:00387
16 Jul 2018 01:00389
16 Jul 2018 02:00392
16 Jul 2018 03:00394
16 Jul 2018 04:00395
16 Jul 2018 05:00392
16 Jul 2018 06:00392
16 Jul 2018 07:00389
16 Jul 2018 08:00395
16 Jul 2018 09:00397
16 Jul 2018 10:00396
16 Jul 2018 11:00404
16 Jul 2018 12:00403
16 Jul 2018 13:00416
16 Jul 2018 14:00411
16 Jul 2018 15:00411
16 Jul 2018 16:00406
16 Jul 2018 17:00411
16 Jul 2018 18:00415
16 Jul 2018 19:00409
16 Jul 2018 20:00408
16 Jul 2018 21:00408
16 Jul 2018 22:00418
16 Jul 2018 23:00439
17 Jul 2018 00:00465
17 Jul 2018 01:00505
17 Jul 2018 02:00434
17 Jul 2018 03:00425
17 Jul 2018 04:00414
17 Jul 2018 05:00413
17 Jul 2018 06:00406
17 Jul 2018 07:00413
17 Jul 2018 08:00406
17 Jul 2018 09:00410
17 Jul 2018 10:00404
17 Jul 2018 11:00405
17 Jul 2018 12:00405
17 Jul 2018 13:00414
17 Jul 2018 14:00416
17 Jul 2018 15:00410
17 Jul 2018 16:00436
17 Jul 2018 17:00415
17 Jul 2018 18:00412
17 Jul 2018 19:00421
17 Jul 2018 20:00418
17 Jul 2018 21:00415
17 Jul 2018 22:00417
17 Jul 2018 23:00409
18 Jul 2018 00:00416
18 Jul 2018 01:00411
18 Jul 2018 02:00425
18 Jul 2018 03:00404
18 Jul 2018 04:00419
18 Jul 2018 05:00424
18 Jul 2018 06:00412
18 Jul 2018 07:00415
18 Jul 2018 08:00670
18 Jul 2018 09:00417
18 Jul 2018 10:00416
18 Jul 2018 11:00413
18 Jul 2018 12:00441
18 Jul 2018 13:00414
18 Jul 2018 14:00409
18 Jul 2018 15:00446
18 Jul 2018 16:00418
18 Jul 2018 17:00414
18 Jul 2018 18:00412
18 Jul 2018 19:00416
18 Jul 2018 20:00425
18 Jul 2018 21:00417
18 Jul 2018 22:00403
18 Jul 2018 23:00412
19 Jul 2018 00:00670
19 Jul 2018 01:00407
19 Jul 2018 02:00418
19 Jul 2018 03:00411
19 Jul 2018 04:00399
19 Jul 2018 05:00403
19 Jul 2018 06:00408
19 Jul 2018 07:00410
19 Jul 2018 08:00407
19 Jul 2018 09:00409
19 Jul 2018 10:00411
19 Jul 2018 11:00415
19 Jul 2018 12:00408
19 Jul 2018 13:00420
19 Jul 2018 14:00410
19 Jul 2018 15:00414
19 Jul 2018 16:00415
19 Jul 2018 17:00413
19 Jul 2018 18:00408
19 Jul 2018 19:00419
19 Jul 2018 20:00433
19 Jul 2018 21:00407
19 Jul 2018 22:00415
19 Jul 2018 23:00396
20 Jul 2018 00:00424
20 Jul 2018 01:00413
20 Jul 2018 02:00409
20 Jul 2018 03:00412
20 Jul 2018 04:00419
20 Jul 2018 05:00416
20 Jul 2018 06:00412
20 Jul 2018 07:00402
20 Jul 2018 08:00403
20 Jul 2018 09:00403
20 Jul 2018 10:00376
20 Jul 2018 11:00388
20 Jul 2018 12:00368
20 Jul 2018 13:00378
20 Jul 2018 14:00391
20 Jul 2018 15:00377
20 Jul 2018 16:00395
20 Jul 2018 17:00393
20 Jul 2018 18:00397
20 Jul 2018 19:00380
20 Jul 2018 20:00384
20 Jul 2018 21:00390
20 Jul 2018 22:00378
20 Jul 2018 23:00386
21 Jul 2018 00:00379
21 Jul 2018 01:00381
21 Jul 2018 02:00378
21 Jul 2018 03:00380
21 Jul 2018 04:00378
21 Jul 2018 05:00380
21 Jul 2018 06:00379
21 Jul 2018 07:00376
21 Jul 2018 08:00374
21 Jul 2018 09:00378
21 Jul 2018 10:00372
21 Jul 2018 11:00375
21 Jul 2018 12:00380
21 Jul 2018 13:00394
21 Jul 2018 14:00388
21 Jul 2018 15:00396
21 Jul 2018 16:00388
21 Jul 2018 17:00381
21 Jul 2018 18:00387
21 Jul 2018 19:00384
21 Jul 2018 20:00379
21 Jul 2018 21:00379

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1256484212
Misses7323316

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.