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
27 May 2017 00:0013852
28 May 2017 00:0013021
29 May 2017 00:0016505
30 May 2017 00:0017264
31 May 2017 00:0015641
1 Jun 2017 00:0014651
2 Jun 2017 00:0014183
3 Jun 2017 00:0011029
4 Jun 2017 00:0010718
5 Jun 2017 00:0013576
6 Jun 2017 00:0014018
7 Jun 2017 00:0013880
8 Jun 2017 00:0021087
9 Jun 2017 00:0017936
10 Jun 2017 00:0015135
11 Jun 2017 00:0015489
12 Jun 2017 00:0012329
13 Jun 2017 00:007147
14 Jun 2017 00:006690
15 Jun 2017 00:005846
16 Jun 2017 00:006206
17 Jun 2017 00:005061
18 Jun 2017 00:004958
19 Jun 2017 00:006569
20 Jun 2017 00:006327
21 Jun 2017 00:006147
22 Jun 2017 00:006190
23 Jun 2017 00:005982
24 Jun 2017 00:005356
25 Jun 2017 00:004808
26 Jun 2017 00:006057
27 Jun 2017 00:005771
28 Jun 2017 00:005527
29 Jun 2017 00:005878
30 Jun 2017 00:007762
1 Jul 2017 00:007065
2 Jul 2017 00:007470
3 Jul 2017 00:007905
4 Jul 2017 00:006569
5 Jul 2017 00:005312
6 Jul 2017 00:004952
7 Jul 2017 00:004813
8 Jul 2017 00:004233
9 Jul 2017 00:004958
10 Jul 2017 00:005599
11 Jul 2017 00:006365
12 Jul 2017 00:004924
13 Jul 2017 00:004756
14 Jul 2017 00:004852
15 Jul 2017 00:004684
16 Jul 2017 00:004682
17 Jul 2017 00:004814
18 Jul 2017 00:004988
19 Jul 2017 00:006011
20 Jul 2017 00:007895
21 Jul 2017 00:007132
22 Jul 2017 00:005979
23 Jul 2017 00:006039
24 Jul 2017 00:006874
25 Jul 2017 00:007335
26 Jul 2017 00:006554
27 Jul 2017 00:006067
28 Jul 2017 00:006409
29 Jul 2017 00:005433
30 Jul 2017 00:005350
31 Jul 2017 00:005996
1 Aug 2017 00:006367
2 Aug 2017 00:006215
3 Aug 2017 00:006396
4 Aug 2017 00:006189
5 Aug 2017 00:005968
6 Aug 2017 00:005840
7 Aug 2017 00:00206334
8 Aug 2017 00:0074052
9 Aug 2017 00:007345
10 Aug 2017 00:006240
11 Aug 2017 00:007041
12 Aug 2017 00:006464
13 Aug 2017 00:005849
14 Aug 2017 00:006595
15 Aug 2017 00:0018794
16 Aug 2017 00:0021050
17 Aug 2017 00:0019793
18 Aug 2017 00:0021319
19 Aug 2017 00:0014929
20 Aug 2017 00:0016354
21 Aug 2017 00:0021066
22 Aug 2017 00:0031721
23 Aug 2017 00:0032841
24 Aug 2017 00:0035960
25 Aug 2017 00:0032061
26 Aug 2017 00:0020937
27 Aug 2017 00:0028980
28 Aug 2017 00:0038503
29 Aug 2017 00:0035608
30 Aug 2017 00:0027442
31 Aug 2017 00:0025957
1 Sep 2017 00:0032924
2 Sep 2017 00:0026209
3 Sep 2017 00:0024733
4 Sep 2017 00:0038793
5 Sep 2017 00:0035800
6 Sep 2017 00:0043648
7 Sep 2017 00:0044329
8 Sep 2017 00:0019807
9 Sep 2017 00:0013950
10 Sep 2017 00:0014122
11 Sep 2017 00:0019304
12 Sep 2017 00:0018458
13 Sep 2017 00:0017228
14 Sep 2017 00:0017193
15 Sep 2017 00:0016695
16 Sep 2017 00:0012778
17 Sep 2017 00:0014574
18 Sep 2017 00:0019041
19 Sep 2017 00:0018509
20 Sep 2017 00:0019068
21 Sep 2017 00:0028252
22 Sep 2017 00:0030977
23 Sep 2017 00:0021591
24 Sep 2017 00:0019663
25 Sep 2017 00:0025435
26 Sep 2017 00:0021134
27 Sep 2017 00:0033318
28 Sep 2017 00:0027138
29 Sep 2017 00:0022274
30 Sep 2017 00:0018969
1 Oct 2017 00:0021628
2 Oct 2017 00:0029729
3 Oct 2017 00:0025613
4 Oct 2017 00:0033249
5 Oct 2017 00:0029151
6 Oct 2017 00:0024892
7 Oct 2017 00:0019163
8 Oct 2017 00:0018793
9 Oct 2017 00:0026464
10 Oct 2017 00:0024835
11 Oct 2017 00:0024083
12 Oct 2017 00:0022880
13 Oct 2017 00:0036585
14 Oct 2017 00:0022849
15 Oct 2017 00:0020893
16 Oct 2017 00:0024402
17 Oct 2017 00:0021452
18 Oct 2017 00:0018498
19 Oct 2017 00:0033279
20 Oct 2017 00:0023075
21 Oct 2017 00:0015389
22 Oct 2017 00:0016261
23 Oct 2017 00:0021955
24 Oct 2017 00:0022926
25 Oct 2017 00:0022666
26 Oct 2017 00:0028782
27 Oct 2017 00:0021050
28 Oct 2017 00:0015350
29 Oct 2017 00:0018613
30 Oct 2017 00:0023166
31 Oct 2017 00:0021061
1 Nov 2017 00:0022992
2 Nov 2017 00:0021318
3 Nov 2017 00:0018258
4 Nov 2017 00:0014184
5 Nov 2017 00:0015646
6 Nov 2017 00:0022356
7 Nov 2017 00:0022069
8 Nov 2017 00:0019766
9 Nov 2017 00:0020882
10 Nov 2017 00:0017796
11 Nov 2017 00:0015182
12 Nov 2017 00:0016366
13 Nov 2017 00:0025433
14 Nov 2017 00:0028570
15 Nov 2017 00:0024693
16 Nov 2017 00:0023059
17 Nov 2017 00:0024067
18 Nov 2017 00:0018272
19 Nov 2017 00:0018106
20 Nov 2017 00:0022212
21 Nov 2017 00:0021723
22 Nov 2017 00:008988

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
16 Nov 2017 11:00337
16 Nov 2017 12:00339
16 Nov 2017 13:00345
16 Nov 2017 14:00349
16 Nov 2017 15:00340
16 Nov 2017 16:00335
16 Nov 2017 17:00338
16 Nov 2017 18:00350
16 Nov 2017 19:00345
16 Nov 2017 20:00338
16 Nov 2017 21:00340
16 Nov 2017 22:00349
16 Nov 2017 23:00334
17 Nov 2017 00:00342
17 Nov 2017 01:00345
17 Nov 2017 02:00345
17 Nov 2017 03:00330
17 Nov 2017 04:00353
17 Nov 2017 05:00439
17 Nov 2017 06:00350
17 Nov 2017 07:00371
17 Nov 2017 08:00345
17 Nov 2017 09:00333
17 Nov 2017 10:00353
17 Nov 2017 11:00332
17 Nov 2017 12:00358
17 Nov 2017 13:00348
17 Nov 2017 14:00340
17 Nov 2017 15:00347
17 Nov 2017 16:00342
17 Nov 2017 17:00341
17 Nov 2017 18:00354
17 Nov 2017 19:00347
17 Nov 2017 20:00332
17 Nov 2017 21:00344
17 Nov 2017 22:00347
17 Nov 2017 23:00342
18 Nov 2017 00:00334
18 Nov 2017 01:00343
18 Nov 2017 02:00346
18 Nov 2017 03:00338
18 Nov 2017 04:00357
18 Nov 2017 05:00352
18 Nov 2017 06:00350
18 Nov 2017 07:00343
18 Nov 2017 08:00347
18 Nov 2017 09:00340
18 Nov 2017 10:00345
18 Nov 2017 11:00352
18 Nov 2017 12:00344
18 Nov 2017 13:00345
18 Nov 2017 14:00342
18 Nov 2017 15:00347
18 Nov 2017 16:00346
18 Nov 2017 17:00360
18 Nov 2017 18:00349
18 Nov 2017 19:00362
18 Nov 2017 20:00371
18 Nov 2017 21:00349
18 Nov 2017 22:00358
18 Nov 2017 23:00360
19 Nov 2017 00:00344
19 Nov 2017 01:00346
19 Nov 2017 02:00340
19 Nov 2017 03:00347
19 Nov 2017 04:00346
19 Nov 2017 05:00339
19 Nov 2017 06:00341
19 Nov 2017 07:00341
19 Nov 2017 08:00357
19 Nov 2017 09:00337
19 Nov 2017 10:00343
19 Nov 2017 11:00342
19 Nov 2017 12:00353
19 Nov 2017 13:00352
19 Nov 2017 14:00346
19 Nov 2017 15:00349
19 Nov 2017 16:00344
19 Nov 2017 17:00368
19 Nov 2017 18:00349
19 Nov 2017 19:00347
19 Nov 2017 20:00343
19 Nov 2017 21:00355
19 Nov 2017 22:00370
19 Nov 2017 23:00366
20 Nov 2017 00:00382
20 Nov 2017 01:00375
20 Nov 2017 02:00360
20 Nov 2017 03:00352
20 Nov 2017 04:00343
20 Nov 2017 05:00347
20 Nov 2017 06:00353
20 Nov 2017 07:00343
20 Nov 2017 08:00350
20 Nov 2017 09:00358
20 Nov 2017 10:00345
20 Nov 2017 11:00362
20 Nov 2017 12:00345
20 Nov 2017 13:00360
20 Nov 2017 14:00345
20 Nov 2017 15:00348
20 Nov 2017 16:00352
20 Nov 2017 17:00388
20 Nov 2017 18:00379
20 Nov 2017 19:00379
20 Nov 2017 20:00383
20 Nov 2017 21:00350
20 Nov 2017 22:00336
20 Nov 2017 23:00346
21 Nov 2017 00:00348
21 Nov 2017 01:00349
21 Nov 2017 02:00350
21 Nov 2017 03:00340
21 Nov 2017 04:00341
21 Nov 2017 05:00328
21 Nov 2017 06:00333
21 Nov 2017 07:00343
21 Nov 2017 08:00347
21 Nov 2017 09:00340
21 Nov 2017 10:00335
21 Nov 2017 11:00335
21 Nov 2017 12:00343
21 Nov 2017 13:00325
21 Nov 2017 14:00340
21 Nov 2017 15:00347
21 Nov 2017 16:00332
21 Nov 2017 17:00350
21 Nov 2017 18:00327
21 Nov 2017 19:00318
21 Nov 2017 20:00333
21 Nov 2017 21:00333
21 Nov 2017 22:00320
21 Nov 2017 23:00321
22 Nov 2017 00:00333
22 Nov 2017 01:00325
22 Nov 2017 02:00331
22 Nov 2017 03:00327
22 Nov 2017 04:00327
22 Nov 2017 05:00330
22 Nov 2017 06:00326
22 Nov 2017 07:00327
22 Nov 2017 08:00346
22 Nov 2017 09:00340
22 Nov 2017 10:00329
22 Nov 2017 11:00338
22 Nov 2017 12:00330
22 Nov 2017 13:00323
22 Nov 2017 14:00314
22 Nov 2017 15:00318
22 Nov 2017 16:00307
22 Nov 2017 17:00319
22 Nov 2017 18:00314
22 Nov 2017 19:00310
22 Nov 2017 20:00340
22 Nov 2017 21:00327
22 Nov 2017 22:00329
22 Nov 2017 23:00330
23 Nov 2017 00:00322
23 Nov 2017 01:00318
23 Nov 2017 02:00322
23 Nov 2017 03:00319
23 Nov 2017 04:00316
23 Nov 2017 05:00315
23 Nov 2017 06:00314
23 Nov 2017 07:00322
23 Nov 2017 08:00318
23 Nov 2017 09:00337
23 Nov 2017 10:00318
23 Nov 2017 11:00362

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits130355
Misses5782

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 months2 minutes
Last 12 months20 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.