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
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
20 Sep 2018 00:00214459162
21 Sep 2018 00:00202876862
22 Sep 2018 00:00176984834
23 Sep 2018 00:00184642024
24 Sep 2018 00:00210644419
25 Sep 2018 00:00215602373
26 Sep 2018 00:00218750773
27 Sep 2018 00:00214281868
28 Sep 2018 00:00204401545
29 Sep 2018 00:00178487885
30 Sep 2018 00:00182602501
1 Oct 2018 00:00217559151
2 Oct 2018 00:00221243149
3 Oct 2018 00:00216822661
4 Oct 2018 00:00211797983
5 Oct 2018 00:00197291527
6 Oct 2018 00:00181497494
7 Oct 2018 00:00192681667
8 Oct 2018 00:00220899527
9 Oct 2018 00:00222058678
10 Oct 2018 00:00225387017
11 Oct 2018 00:00218307614
12 Oct 2018 00:00199906564
13 Oct 2018 00:00176504319
14 Oct 2018 00:00186317714
15 Oct 2018 00:00220417272
16 Oct 2018 00:00220351359
17 Oct 2018 00:00223736588
18 Oct 2018 00:00214485999
19 Oct 2018 00:00205954852
20 Oct 2018 00:00181594396
21 Oct 2018 00:00189160587
22 Oct 2018 00:00220098614
23 Oct 2018 00:00233654298
24 Oct 2018 00:00225889509
25 Oct 2018 00:00227286219
26 Oct 2018 00:00214455995
27 Oct 2018 00:00185940470
28 Oct 2018 00:00195531168
29 Oct 2018 00:00236927899
30 Oct 2018 00:00235105647
31 Oct 2018 00:00234424683
1 Nov 2018 00:00225793203
2 Nov 2018 00:00225227073
3 Nov 2018 00:00201575434
4 Nov 2018 00:00211301435
5 Nov 2018 00:00234064925
6 Nov 2018 00:00237597108
7 Nov 2018 00:00253877405
8 Nov 2018 00:00245688169
9 Nov 2018 00:00242694815
10 Nov 2018 00:00214263628
11 Nov 2018 00:00219963926
12 Nov 2018 00:00246457976
13 Nov 2018 00:00248046885
14 Nov 2018 00:00242012609
15 Nov 2018 00:00241660633
16 Nov 2018 00:00230559838
17 Nov 2018 00:00196237119
18 Nov 2018 00:00203942803
19 Nov 2018 00:00234548203
20 Nov 2018 00:00234270906
21 Nov 2018 00:00227568994
22 Nov 2018 00:00217282600
23 Nov 2018 00:00227562749
24 Nov 2018 00:00199350244
25 Nov 2018 00:00211949282
26 Nov 2018 00:00246545573
27 Nov 2018 00:00241844997
28 Nov 2018 00:00238673645
29 Nov 2018 00:00232250880
30 Nov 2018 00:00220442480
1 Dec 2018 00:00193818651
2 Dec 2018 00:00197279570
3 Dec 2018 00:00228199692
4 Dec 2018 00:00232848092
5 Dec 2018 00:00231818684
6 Dec 2018 00:00231154793
7 Dec 2018 00:00223634735
8 Dec 2018 00:00196776481
9 Dec 2018 00:00201651429
10 Dec 2018 00:00234555412
11 Dec 2018 00:00231224298
12 Dec 2018 00:00231908062
13 Dec 2018 00:00227977328

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
7 Dec 2018 08:00248
7 Dec 2018 09:00245
7 Dec 2018 10:00254
7 Dec 2018 11:00242
7 Dec 2018 12:00245
7 Dec 2018 13:00247
7 Dec 2018 14:00249
7 Dec 2018 15:00252
7 Dec 2018 16:00254
7 Dec 2018 17:00258
7 Dec 2018 18:00248
7 Dec 2018 19:00248
7 Dec 2018 20:00250
7 Dec 2018 21:00254
7 Dec 2018 22:00256
7 Dec 2018 23:00249
8 Dec 2018 00:00250
8 Dec 2018 01:00249
8 Dec 2018 02:00276
8 Dec 2018 03:00252
8 Dec 2018 04:00256
8 Dec 2018 05:00254
8 Dec 2018 06:00250
8 Dec 2018 07:00242
8 Dec 2018 08:00247
8 Dec 2018 09:00242
8 Dec 2018 10:00245
8 Dec 2018 11:00245
8 Dec 2018 12:00244
8 Dec 2018 13:00249
8 Dec 2018 14:00249
8 Dec 2018 15:00243
8 Dec 2018 16:00257
8 Dec 2018 17:00251
8 Dec 2018 18:00252
8 Dec 2018 19:00251
8 Dec 2018 20:00244
8 Dec 2018 21:00245
8 Dec 2018 22:00245
8 Dec 2018 23:00242
9 Dec 2018 00:00252
9 Dec 2018 01:00248
9 Dec 2018 02:00263
9 Dec 2018 03:00249
9 Dec 2018 04:00254
9 Dec 2018 05:00257
9 Dec 2018 06:00265
9 Dec 2018 07:00243
9 Dec 2018 08:00250
9 Dec 2018 09:00250
9 Dec 2018 10:00252
9 Dec 2018 11:00250
9 Dec 2018 12:00249
9 Dec 2018 13:00242
9 Dec 2018 14:00250
9 Dec 2018 15:00253
9 Dec 2018 16:00252
9 Dec 2018 17:00251
9 Dec 2018 18:00255
9 Dec 2018 19:00254
9 Dec 2018 20:00247
9 Dec 2018 21:00247
9 Dec 2018 22:00247
9 Dec 2018 23:00245
10 Dec 2018 00:00259
10 Dec 2018 01:00246
10 Dec 2018 02:00250
10 Dec 2018 03:00251
10 Dec 2018 04:00246
10 Dec 2018 05:00252
10 Dec 2018 06:00247
10 Dec 2018 07:00260
10 Dec 2018 08:00248
10 Dec 2018 09:00243
10 Dec 2018 10:00252
10 Dec 2018 11:00244
10 Dec 2018 12:00270
10 Dec 2018 13:00276
10 Dec 2018 14:00271
10 Dec 2018 15:00271
10 Dec 2018 16:00272
10 Dec 2018 17:00268
10 Dec 2018 18:00274
10 Dec 2018 19:00266
10 Dec 2018 20:00260
10 Dec 2018 21:00261
10 Dec 2018 22:00264
10 Dec 2018 23:00264
11 Dec 2018 00:00274
11 Dec 2018 01:00265
11 Dec 2018 02:00263
11 Dec 2018 03:00267
11 Dec 2018 04:00268
11 Dec 2018 05:00299
11 Dec 2018 06:00263
11 Dec 2018 07:00263
11 Dec 2018 08:00267
11 Dec 2018 09:00266
11 Dec 2018 10:00263
11 Dec 2018 11:00272
11 Dec 2018 12:00267
11 Dec 2018 13:00262
11 Dec 2018 14:00265
11 Dec 2018 15:00266
11 Dec 2018 16:00267
11 Dec 2018 17:00267
11 Dec 2018 18:00266
11 Dec 2018 19:00264
11 Dec 2018 20:00268
11 Dec 2018 21:00265
11 Dec 2018 22:00267
11 Dec 2018 23:00268
12 Dec 2018 00:00266
12 Dec 2018 01:00278
12 Dec 2018 02:00276
12 Dec 2018 03:00274
12 Dec 2018 04:00278
12 Dec 2018 05:00270
12 Dec 2018 06:00266
12 Dec 2018 07:00273
12 Dec 2018 08:00272
12 Dec 2018 09:00277
12 Dec 2018 10:00282
12 Dec 2018 11:00270
12 Dec 2018 12:00269
12 Dec 2018 13:00267
12 Dec 2018 14:00268
12 Dec 2018 15:00270
12 Dec 2018 16:00269
12 Dec 2018 17:00272
12 Dec 2018 18:00269
12 Dec 2018 19:00269
12 Dec 2018 20:00270
12 Dec 2018 21:00265
12 Dec 2018 22:00269
12 Dec 2018 23:00271
13 Dec 2018 00:00278
13 Dec 2018 01:00276
13 Dec 2018 02:00267
13 Dec 2018 03:00274
13 Dec 2018 04:00270
13 Dec 2018 05:00269
13 Dec 2018 06:00272
13 Dec 2018 07:00274
13 Dec 2018 08:00523
13 Dec 2018 09:00265
13 Dec 2018 10:00276
13 Dec 2018 11:00273
13 Dec 2018 12:00278
13 Dec 2018 13:00280
13 Dec 2018 14:00285
13 Dec 2018 15:00285
13 Dec 2018 16:00291
13 Dec 2018 17:00285
13 Dec 2018 18:00291
13 Dec 2018 19:00280
13 Dec 2018 20:00280
13 Dec 2018 21:00294
13 Dec 2018 22:00276
13 Dec 2018 23:00285
14 Dec 2018 00:00275
14 Dec 2018 01:00278
14 Dec 2018 02:00279
14 Dec 2018 03:00275
14 Dec 2018 04:00274
14 Dec 2018 05:00274
14 Dec 2018 06:00315
14 Dec 2018 07:00282
14 Dec 2018 08:00341

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1515743808
Misses12208106

Availability

Total downtime, according to Pingdom:

Last 30 days7 minutes
Last 3 monthsan hour
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.