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
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
21 Jul 2018 00:00153735686
22 Jul 2018 00:00155799489
23 Jul 2018 00:00184047327
24 Jul 2018 00:00185786854
25 Jul 2018 00:00188127044
26 Jul 2018 00:00188148350
27 Jul 2018 00:00179461125
28 Jul 2018 00:00151914267
29 Jul 2018 00:00158327721
30 Jul 2018 00:00194810279
31 Jul 2018 00:00187671458
1 Aug 2018 00:00189129819
2 Aug 2018 00:00193955714
3 Aug 2018 00:00188358351
4 Aug 2018 00:00164639196
5 Aug 2018 00:00164416196
6 Aug 2018 00:00196826674
7 Aug 2018 00:00195402821
8 Aug 2018 00:00195120665
9 Aug 2018 00:00198795420
10 Aug 2018 00:00192380033
11 Aug 2018 00:00176397308
12 Aug 2018 00:00172460244
13 Aug 2018 00:00204940943
14 Aug 2018 00:00209253738
15 Aug 2018 00:00203638044
16 Aug 2018 00:00206098917
17 Aug 2018 00:00195225713
18 Aug 2018 00:00170245173
19 Aug 2018 00:00174097146
20 Aug 2018 00:00207576928
21 Aug 2018 00:00206043856
22 Aug 2018 00:00206945406
23 Aug 2018 00:00205443151
24 Aug 2018 00:00199558975
25 Aug 2018 00:00164472825
26 Aug 2018 00:00168652026
27 Aug 2018 00:00201061611
28 Aug 2018 00:00205702407
29 Aug 2018 00:00209786493
30 Aug 2018 00:00216145938
31 Aug 2018 00:00206920042
1 Sep 2018 00:00181394550
2 Sep 2018 00:00185216407
3 Sep 2018 00:00209386924
4 Sep 2018 00:00212114994
5 Sep 2018 00:00213241846
6 Sep 2018 00:00209668448
7 Sep 2018 00:00195409046
8 Sep 2018 00:00176644226
9 Sep 2018 00:00184621984
10 Sep 2018 00:00212369040
11 Sep 2018 00:00213016849
12 Sep 2018 00:00215262327
13 Sep 2018 00:00212849346
14 Sep 2018 00:00203920432
15 Sep 2018 00:00171286888
16 Sep 2018 00:00179828339
17 Sep 2018 00:00205531996
18 Sep 2018 00:00216704466
19 Sep 2018 00:00214324861

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
13 Sep 2018 05:00372
13 Sep 2018 06:00386
13 Sep 2018 07:00378
13 Sep 2018 08:00372
13 Sep 2018 09:00371
13 Sep 2018 10:00372
13 Sep 2018 11:00373
13 Sep 2018 12:00389
13 Sep 2018 13:00381
13 Sep 2018 14:00381
13 Sep 2018 15:00370
13 Sep 2018 16:00386
13 Sep 2018 17:00384
13 Sep 2018 18:00379
13 Sep 2018 19:00379
13 Sep 2018 20:00382
13 Sep 2018 21:00367
13 Sep 2018 22:00388
13 Sep 2018 23:00383
14 Sep 2018 00:00369
14 Sep 2018 01:00366
14 Sep 2018 02:00372
14 Sep 2018 03:00373
14 Sep 2018 04:00361
14 Sep 2018 05:00380
14 Sep 2018 06:00374
14 Sep 2018 07:00367
14 Sep 2018 08:00369
14 Sep 2018 09:00376
14 Sep 2018 10:00381
14 Sep 2018 11:00368
14 Sep 2018 12:00371
14 Sep 2018 13:00370
14 Sep 2018 14:00375
14 Sep 2018 15:00373
14 Sep 2018 16:00370
14 Sep 2018 17:00363
14 Sep 2018 18:00371
14 Sep 2018 19:00381
14 Sep 2018 20:00385
14 Sep 2018 21:00370
14 Sep 2018 22:00394
14 Sep 2018 23:00409
15 Sep 2018 00:00387
15 Sep 2018 01:00392
15 Sep 2018 02:00393
15 Sep 2018 03:00413
15 Sep 2018 04:00398
15 Sep 2018 05:00403
15 Sep 2018 06:00409
15 Sep 2018 07:00401
15 Sep 2018 08:00389
15 Sep 2018 09:00403
15 Sep 2018 10:00394
15 Sep 2018 11:00393
15 Sep 2018 12:00403
15 Sep 2018 13:00392
15 Sep 2018 14:00399
15 Sep 2018 15:00405
15 Sep 2018 16:00390
15 Sep 2018 17:00400
15 Sep 2018 18:00396
15 Sep 2018 19:00397
15 Sep 2018 20:00385
15 Sep 2018 21:00382
15 Sep 2018 22:00387
15 Sep 2018 23:00389
16 Sep 2018 00:00393
16 Sep 2018 01:00395
16 Sep 2018 02:00400
16 Sep 2018 03:00386
16 Sep 2018 04:00398
16 Sep 2018 05:00414
16 Sep 2018 06:00411
16 Sep 2018 07:00421
16 Sep 2018 08:00422
16 Sep 2018 09:00423
16 Sep 2018 10:00424
16 Sep 2018 11:00429
16 Sep 2018 12:00429
16 Sep 2018 13:00446
16 Sep 2018 14:00444
16 Sep 2018 15:00456
16 Sep 2018 16:00440
16 Sep 2018 17:00435
16 Sep 2018 18:00448
16 Sep 2018 19:00476
16 Sep 2018 20:00453
16 Sep 2018 21:00443
16 Sep 2018 22:00433
16 Sep 2018 23:00438
17 Sep 2018 00:00441
17 Sep 2018 01:00441
17 Sep 2018 02:00428
17 Sep 2018 03:00439
17 Sep 2018 04:00429
17 Sep 2018 05:00420
17 Sep 2018 06:00422
17 Sep 2018 07:00431
17 Sep 2018 08:00431
17 Sep 2018 09:00421
17 Sep 2018 10:00429
17 Sep 2018 11:00435
17 Sep 2018 12:00430
17 Sep 2018 13:00429
17 Sep 2018 14:00447
17 Sep 2018 15:00423
17 Sep 2018 16:00427
17 Sep 2018 17:00419
17 Sep 2018 18:00427
17 Sep 2018 19:00437
17 Sep 2018 20:00423
17 Sep 2018 21:00423
17 Sep 2018 22:00445
17 Sep 2018 23:00452
18 Sep 2018 00:00474
18 Sep 2018 01:00487
18 Sep 2018 02:00453
18 Sep 2018 03:00418
18 Sep 2018 04:00462
18 Sep 2018 05:00431
18 Sep 2018 06:00426
18 Sep 2018 07:00432
18 Sep 2018 08:00424
18 Sep 2018 09:00424
18 Sep 2018 10:00420
18 Sep 2018 11:00424
18 Sep 2018 12:00422
18 Sep 2018 13:00440
18 Sep 2018 14:00430
18 Sep 2018 15:00432
18 Sep 2018 16:00433
18 Sep 2018 17:00424
18 Sep 2018 18:00431
18 Sep 2018 19:00417
18 Sep 2018 20:00423
18 Sep 2018 21:00444
18 Sep 2018 22:00427
18 Sep 2018 23:00416
19 Sep 2018 00:00429
19 Sep 2018 01:00427
19 Sep 2018 02:00430
19 Sep 2018 03:00423
19 Sep 2018 04:00416
19 Sep 2018 05:00415
19 Sep 2018 06:00415
19 Sep 2018 07:00413
19 Sep 2018 08:00431
19 Sep 2018 09:00435
19 Sep 2018 10:00423
19 Sep 2018 11:00435
19 Sep 2018 12:00423
19 Sep 2018 13:00435
19 Sep 2018 14:00420
19 Sep 2018 15:00436
19 Sep 2018 16:00436
19 Sep 2018 17:00416
19 Sep 2018 18:00431
19 Sep 2018 19:00425
19 Sep 2018 20:00410
19 Sep 2018 21:00411
19 Sep 2018 22:00414
19 Sep 2018 23:00415
20 Sep 2018 00:00414
20 Sep 2018 01:00419
20 Sep 2018 02:00424
20 Sep 2018 03:00438
20 Sep 2018 04:00412
20 Sep 2018 05:00416

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1384279403
Misses9940423

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 monthsNone
Last 12 months3 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.