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
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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
8 Aug 2018 22:00393
8 Aug 2018 23:00385
9 Aug 2018 00:00385
9 Aug 2018 01:00384
9 Aug 2018 02:00382
9 Aug 2018 03:00386
9 Aug 2018 04:00381
9 Aug 2018 05:00388
9 Aug 2018 06:00385
9 Aug 2018 07:00396
9 Aug 2018 08:00379
9 Aug 2018 09:00387
9 Aug 2018 10:00372
9 Aug 2018 11:00397
9 Aug 2018 12:00386
9 Aug 2018 13:00382
9 Aug 2018 14:00385
9 Aug 2018 15:00499
9 Aug 2018 16:00387
9 Aug 2018 17:00398
9 Aug 2018 18:00363
9 Aug 2018 19:00355
9 Aug 2018 20:00357
9 Aug 2018 21:00346
9 Aug 2018 22:00347
9 Aug 2018 23:00351
10 Aug 2018 00:00354
10 Aug 2018 01:00350
10 Aug 2018 02:00354
10 Aug 2018 03:00354
10 Aug 2018 04:00348
10 Aug 2018 05:00370
10 Aug 2018 06:00406
10 Aug 2018 07:00380
10 Aug 2018 08:00392
10 Aug 2018 09:00377
10 Aug 2018 10:00341
10 Aug 2018 11:00343
10 Aug 2018 12:00350
10 Aug 2018 13:00348
10 Aug 2018 14:00341
10 Aug 2018 15:00341
10 Aug 2018 16:00353
10 Aug 2018 17:00541
10 Aug 2018 18:00348
10 Aug 2018 19:00347
10 Aug 2018 20:00356
10 Aug 2018 21:00350
10 Aug 2018 22:00349
10 Aug 2018 23:00368
11 Aug 2018 00:00385
11 Aug 2018 01:00350
11 Aug 2018 02:00356
11 Aug 2018 03:00339
11 Aug 2018 04:00348
11 Aug 2018 05:00342
11 Aug 2018 06:00348
11 Aug 2018 07:00343
11 Aug 2018 08:00350
11 Aug 2018 09:00356
11 Aug 2018 10:00348
11 Aug 2018 11:00350
11 Aug 2018 12:00350
11 Aug 2018 13:00344
11 Aug 2018 14:00346
11 Aug 2018 15:00356
11 Aug 2018 16:00355
11 Aug 2018 17:00350
11 Aug 2018 18:00348
11 Aug 2018 19:00349
11 Aug 2018 20:00347
11 Aug 2018 21:00341
11 Aug 2018 22:00357
11 Aug 2018 23:00346
12 Aug 2018 00:00345
12 Aug 2018 01:00353
12 Aug 2018 02:00346
12 Aug 2018 03:00341
12 Aug 2018 04:00345
12 Aug 2018 05:00347
12 Aug 2018 06:00345
12 Aug 2018 07:00350
12 Aug 2018 08:00345
12 Aug 2018 09:00344
12 Aug 2018 10:00354
12 Aug 2018 11:00348
12 Aug 2018 12:00349
12 Aug 2018 13:00345
12 Aug 2018 14:00346
12 Aug 2018 15:00351
12 Aug 2018 16:00355
12 Aug 2018 17:00358
12 Aug 2018 18:00354
12 Aug 2018 19:00361
12 Aug 2018 20:00376
12 Aug 2018 21:00371
12 Aug 2018 22:00484
12 Aug 2018 23:00388
13 Aug 2018 00:00378
13 Aug 2018 01:00380
13 Aug 2018 02:00386
13 Aug 2018 03:00378
13 Aug 2018 04:00377
13 Aug 2018 05:00375
13 Aug 2018 06:00376
13 Aug 2018 07:00386
13 Aug 2018 08:00380
13 Aug 2018 09:00366
13 Aug 2018 10:00376
13 Aug 2018 11:00374
13 Aug 2018 12:00376
13 Aug 2018 13:00488
13 Aug 2018 14:00442
13 Aug 2018 15:00622
13 Aug 2018 16:00409
13 Aug 2018 17:00479
13 Aug 2018 18:00564
13 Aug 2018 19:00422
13 Aug 2018 20:00549
13 Aug 2018 21:00412
13 Aug 2018 22:00393
13 Aug 2018 23:00403
14 Aug 2018 00:00392
14 Aug 2018 01:00409
14 Aug 2018 02:00398
14 Aug 2018 03:00390
14 Aug 2018 04:00404
14 Aug 2018 05:00406
14 Aug 2018 06:00409
14 Aug 2018 07:00400
14 Aug 2018 08:00409
14 Aug 2018 09:00394
14 Aug 2018 10:00397
14 Aug 2018 11:00437
14 Aug 2018 12:00394
14 Aug 2018 13:00375
14 Aug 2018 14:00381
14 Aug 2018 15:00389
14 Aug 2018 16:00472
14 Aug 2018 17:00377
14 Aug 2018 18:00397
14 Aug 2018 19:00378
14 Aug 2018 20:00369
14 Aug 2018 21:00379
14 Aug 2018 22:00373
14 Aug 2018 23:00388
15 Aug 2018 00:00381
15 Aug 2018 01:00372
15 Aug 2018 02:00396
15 Aug 2018 03:00524
15 Aug 2018 04:00409
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 22:00420

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1331250829
Misses8471910

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.