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
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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
15 Aug 2018 05:00435
15 Aug 2018 06:00370
15 Aug 2018 07:00379
15 Aug 2018 08:00379
15 Aug 2018 09:00369
15 Aug 2018 10:00377
15 Aug 2018 11:00378
15 Aug 2018 12:00375
15 Aug 2018 13:00377
15 Aug 2018 14:00432
15 Aug 2018 15:00369
15 Aug 2018 16:00549
15 Aug 2018 17:00623
15 Aug 2018 18:00581
15 Aug 2018 19:00418
15 Aug 2018 20:00513
15 Aug 2018 21:00424
15 Aug 2018 22:00418
15 Aug 2018 23:00418
16 Aug 2018 00:00408
16 Aug 2018 01:00422
16 Aug 2018 02:00420
16 Aug 2018 03:00389
16 Aug 2018 04:00401
16 Aug 2018 05:00434
16 Aug 2018 06:00393
16 Aug 2018 07:00387
16 Aug 2018 08:00398
16 Aug 2018 09:00399
16 Aug 2018 10:00400
16 Aug 2018 11:00403
16 Aug 2018 12:00409
16 Aug 2018 13:00407
16 Aug 2018 14:00409
16 Aug 2018 15:00409
16 Aug 2018 16:00475
16 Aug 2018 17:00413
16 Aug 2018 18:00401
16 Aug 2018 19:00408
16 Aug 2018 20:00417
16 Aug 2018 21:00401
16 Aug 2018 22:00404
16 Aug 2018 23:00413
17 Aug 2018 00:00407
17 Aug 2018 01:00402
17 Aug 2018 02:00403
17 Aug 2018 03:00402
17 Aug 2018 04:00409
17 Aug 2018 05:00425
17 Aug 2018 06:00414
17 Aug 2018 07:00404
17 Aug 2018 08:00404
17 Aug 2018 09:00408
17 Aug 2018 10:00407
17 Aug 2018 11:00399
17 Aug 2018 12:00418
17 Aug 2018 13:00411
17 Aug 2018 14:00400
17 Aug 2018 15:00428
17 Aug 2018 16:00408
17 Aug 2018 17:00433
17 Aug 2018 18:00409
17 Aug 2018 19:00408
17 Aug 2018 20:00416
17 Aug 2018 21:00412
17 Aug 2018 22:00406
17 Aug 2018 23:00410
18 Aug 2018 00:00399
18 Aug 2018 01:00394
18 Aug 2018 02:00386
18 Aug 2018 03:00389
18 Aug 2018 04:00385
18 Aug 2018 05:00378
18 Aug 2018 06:00379
18 Aug 2018 07:00376
18 Aug 2018 08:00376
18 Aug 2018 09:00368
18 Aug 2018 10:00373
18 Aug 2018 11:00374
18 Aug 2018 12:00385
18 Aug 2018 13:00378
18 Aug 2018 14:00377
18 Aug 2018 15:00382
18 Aug 2018 16:00379
18 Aug 2018 17:00372
18 Aug 2018 18:00497
18 Aug 2018 19:00389
18 Aug 2018 20:00375
18 Aug 2018 21:00394
18 Aug 2018 22:00378
18 Aug 2018 23:00376
19 Aug 2018 00:00376
19 Aug 2018 01:00379
19 Aug 2018 02:00419
19 Aug 2018 03:00385
19 Aug 2018 04:00376
19 Aug 2018 05:00379
19 Aug 2018 06:00383
19 Aug 2018 07:00381
19 Aug 2018 08:00376
19 Aug 2018 09:00375
19 Aug 2018 10:00377
19 Aug 2018 11:00373
19 Aug 2018 12:00369
19 Aug 2018 13:00371
19 Aug 2018 14:00374
19 Aug 2018 15:00386
19 Aug 2018 16:00383
19 Aug 2018 17:00383
19 Aug 2018 18:00376
19 Aug 2018 19:00385
19 Aug 2018 20:00382
19 Aug 2018 21:00376
19 Aug 2018 22:00379
19 Aug 2018 23:00375
20 Aug 2018 00:00391
20 Aug 2018 01:00376
20 Aug 2018 02:00383
20 Aug 2018 03:00379
20 Aug 2018 04:00380
20 Aug 2018 05:00381
20 Aug 2018 06:00378
20 Aug 2018 07:00390
20 Aug 2018 08:00384
20 Aug 2018 09:00421
20 Aug 2018 10:00373
20 Aug 2018 11:00379
20 Aug 2018 12:00382
20 Aug 2018 13:00378
20 Aug 2018 14:00447
20 Aug 2018 15:00580
20 Aug 2018 16:00386
20 Aug 2018 17:00512
20 Aug 2018 18:00482
20 Aug 2018 19:00436
20 Aug 2018 20:00366
20 Aug 2018 21:00358
20 Aug 2018 22:00360
20 Aug 2018 23:00359
21 Aug 2018 00:00357
21 Aug 2018 01:00364
21 Aug 2018 02:00356
21 Aug 2018 03:00357
21 Aug 2018 04:00358
21 Aug 2018 05:00361
21 Aug 2018 06:00362
21 Aug 2018 07:00360
21 Aug 2018 08:00404
21 Aug 2018 09:00354
21 Aug 2018 10:00359
21 Aug 2018 11:00377
21 Aug 2018 12:00453
21 Aug 2018 13:00363
21 Aug 2018 14:00485
21 Aug 2018 15:00394
21 Aug 2018 16:00407
21 Aug 2018 17:00369
21 Aug 2018 18:00355
21 Aug 2018 19:00579
21 Aug 2018 20:00356
21 Aug 2018 21:00418
21 Aug 2018 22:00357
21 Aug 2018 23:00366
22 Aug 2018 00:00356
22 Aug 2018 01:00366
22 Aug 2018 02:00353
22 Aug 2018 03:00356
22 Aug 2018 04:00361
22 Aug 2018 05:00353

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1344886156
Misses7683495

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.