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
29 Mar 2017 00:00270659
30 Mar 2017 00:00242788
31 Mar 2017 00:00173691
1 Apr 2017 00:00146915
2 Apr 2017 00:00143353
3 Apr 2017 00:00182191
4 Apr 2017 00:00188604
5 Apr 2017 00:00165552
6 Apr 2017 00:00152934
7 Apr 2017 00:00140265
8 Apr 2017 00:00111810
9 Apr 2017 00:00110201
10 Apr 2017 00:00117716
11 Apr 2017 00:00104997
12 Apr 2017 00:0088124
13 Apr 2017 00:0083472
14 Apr 2017 00:0088374
15 Apr 2017 00:0077743
16 Apr 2017 00:0068262
17 Apr 2017 00:0062218
18 Apr 2017 00:0070206
19 Apr 2017 00:0064179
20 Apr 2017 00:0057919
21 Apr 2017 00:0054859
22 Apr 2017 00:0046365
23 Apr 2017 00:0046659
24 Apr 2017 00:0053245
25 Apr 2017 00:0050157
26 Apr 2017 00:0053242
27 Apr 2017 00:0050405
28 Apr 2017 00:0044576
29 Apr 2017 00:0037211
30 Apr 2017 00:0034553
1 May 2017 00:0037514
2 May 2017 00:0045274
3 May 2017 00:0031829
4 May 2017 00:0012336
5 May 2017 00:0010569
6 May 2017 00:008398
7 May 2017 00:008139
8 May 2017 00:009889
9 May 2017 00:0030732
10 May 2017 00:0049755
11 May 2017 00:0046078
12 May 2017 00:0050138
13 May 2017 00:0034308
14 May 2017 00:0034007
15 May 2017 00:0047943
16 May 2017 00:0044195
17 May 2017 00:0053209
18 May 2017 00:0047384
19 May 2017 00:0050801
20 May 2017 00:0041219
21 May 2017 00:0041796
22 May 2017 00:0060983
23 May 2017 00:0028251
24 May 2017 00:0025314
25 May 2017 00:0019966
26 May 2017 00:0015792
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
18 Sep 2017 20:00368
18 Sep 2017 21:00368
18 Sep 2017 22:00373
18 Sep 2017 23:00367
19 Sep 2017 00:00363
19 Sep 2017 01:00363
19 Sep 2017 02:00374
19 Sep 2017 03:00386
19 Sep 2017 04:00359
19 Sep 2017 05:00352
19 Sep 2017 06:00371
19 Sep 2017 07:00369
19 Sep 2017 08:00361
19 Sep 2017 09:00374
19 Sep 2017 10:00362
19 Sep 2017 11:00366
19 Sep 2017 12:00371
19 Sep 2017 13:00616
19 Sep 2017 14:00469
19 Sep 2017 15:00378
19 Sep 2017 16:00363
19 Sep 2017 17:00368
19 Sep 2017 18:00373
19 Sep 2017 19:00369
19 Sep 2017 20:00374
19 Sep 2017 21:00367
19 Sep 2017 22:00362
19 Sep 2017 23:00345
20 Sep 2017 00:00340
20 Sep 2017 01:00347
20 Sep 2017 02:00358
20 Sep 2017 03:00349
20 Sep 2017 04:00343
20 Sep 2017 05:00346
20 Sep 2017 06:00352
20 Sep 2017 07:00345
20 Sep 2017 08:00340
20 Sep 2017 09:00342
20 Sep 2017 10:00340
20 Sep 2017 11:00346
20 Sep 2017 12:00331
20 Sep 2017 13:00343
20 Sep 2017 14:00350
20 Sep 2017 15:00346
20 Sep 2017 16:00351
20 Sep 2017 17:00351
20 Sep 2017 18:00414
20 Sep 2017 19:00351
20 Sep 2017 20:00348
20 Sep 2017 21:00350
20 Sep 2017 22:00342
20 Sep 2017 23:00351
21 Sep 2017 00:00338
21 Sep 2017 01:00345
21 Sep 2017 02:00359
21 Sep 2017 03:00345
21 Sep 2017 04:00367
21 Sep 2017 05:00352
21 Sep 2017 06:00356
21 Sep 2017 07:00359
21 Sep 2017 08:00362
21 Sep 2017 09:00352
21 Sep 2017 10:00345
21 Sep 2017 11:00342
21 Sep 2017 12:00345
21 Sep 2017 13:00367
21 Sep 2017 14:00349
21 Sep 2017 15:00345
21 Sep 2017 16:00346
21 Sep 2017 17:00596
21 Sep 2017 18:00340
21 Sep 2017 19:00357
21 Sep 2017 20:00359
21 Sep 2017 21:00350
21 Sep 2017 22:00319
21 Sep 2017 23:00308
22 Sep 2017 00:00303
22 Sep 2017 01:00301
22 Sep 2017 02:00323
22 Sep 2017 03:00322
22 Sep 2017 04:00314
22 Sep 2017 05:00307
22 Sep 2017 06:00358
22 Sep 2017 07:00306
22 Sep 2017 08:00298
22 Sep 2017 09:00307
22 Sep 2017 10:00310
22 Sep 2017 11:00307
22 Sep 2017 12:00318
22 Sep 2017 13:00307
22 Sep 2017 14:00313
22 Sep 2017 15:00331
22 Sep 2017 16:00351
22 Sep 2017 17:00315
22 Sep 2017 18:00324
22 Sep 2017 19:00301
22 Sep 2017 20:00307
22 Sep 2017 21:00300
22 Sep 2017 22:00300
22 Sep 2017 23:00308
23 Sep 2017 00:00317
23 Sep 2017 01:00309
23 Sep 2017 02:00313
23 Sep 2017 03:00311
23 Sep 2017 04:00310
23 Sep 2017 05:00307
23 Sep 2017 06:00307
23 Sep 2017 07:00305
23 Sep 2017 08:00315
23 Sep 2017 09:00316
23 Sep 2017 10:00313
23 Sep 2017 11:00309
23 Sep 2017 12:00310
23 Sep 2017 13:00328
23 Sep 2017 14:00334
23 Sep 2017 15:00319
23 Sep 2017 16:00321
23 Sep 2017 17:00314
23 Sep 2017 18:00325
23 Sep 2017 19:00320
23 Sep 2017 20:00319
23 Sep 2017 21:00304
23 Sep 2017 22:00307
23 Sep 2017 23:00304
24 Sep 2017 00:00331
24 Sep 2017 01:00311
24 Sep 2017 02:00305
24 Sep 2017 03:00304
24 Sep 2017 04:00318
24 Sep 2017 05:00310
24 Sep 2017 06:00361
24 Sep 2017 07:00314
24 Sep 2017 08:00319
24 Sep 2017 09:00312
24 Sep 2017 10:00309
24 Sep 2017 11:00297
24 Sep 2017 12:00304
24 Sep 2017 13:00309
24 Sep 2017 14:00325
24 Sep 2017 15:00313
24 Sep 2017 16:00323
24 Sep 2017 17:00310
24 Sep 2017 18:00323
24 Sep 2017 19:00336
24 Sep 2017 20:00302
24 Sep 2017 21:00315
24 Sep 2017 22:00324
24 Sep 2017 23:00309
25 Sep 2017 00:00311
25 Sep 2017 01:00309
25 Sep 2017 02:00307
25 Sep 2017 03:00305
25 Sep 2017 04:00288
25 Sep 2017 05:00293
25 Sep 2017 06:00312
25 Sep 2017 07:00292
25 Sep 2017 08:00290
25 Sep 2017 09:00295
25 Sep 2017 10:00291
25 Sep 2017 11:00309
25 Sep 2017 12:00308
25 Sep 2017 13:00303
25 Sep 2017 14:00334
25 Sep 2017 15:00296
25 Sep 2017 16:00297
25 Sep 2017 17:00300
25 Sep 2017 18:00315
25 Sep 2017 19:00335
25 Sep 2017 20:00330

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits148546
Misses7093

Availability

Total downtime, according to Pingdom:

Last 30 daysa minute
Last 3 monthsa minute
Last 12 monthsan hour

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.