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
22 Dec 2017 00:0098104419
23 Dec 2017 00:0089353103
24 Dec 2017 00:0083112468
25 Dec 2017 00:0084156503
26 Dec 2017 00:00102034171
27 Dec 2017 00:00108476681
28 Dec 2017 00:00103829254
29 Dec 2017 00:0097626769
30 Dec 2017 00:0091782161
31 Dec 2017 00:0083261386
1 Jan 2018 00:0087187157
2 Jan 2018 00:00108412950
3 Jan 2018 00:00118534439
4 Jan 2018 00:00128923485
5 Jan 2018 00:00124652459
6 Jan 2018 00:00114002907
7 Jan 2018 00:00118316648
8 Jan 2018 00:00132189702
9 Jan 2018 00:00130867281
10 Jan 2018 00:00127827186
11 Jan 2018 00:00127411927
12 Jan 2018 00:00121884686
13 Jan 2018 00:00108305737
14 Jan 2018 00:00113701395
15 Jan 2018 00:00129564506
16 Jan 2018 00:00134840813
17 Jan 2018 00:00130145641
18 Jan 2018 00:00126168580
19 Jan 2018 00:00117482014
20 Jan 2018 00:00105049679
21 Jan 2018 00:00112963724
22 Jan 2018 00:00127463711
23 Jan 2018 00:00128251542
24 Jan 2018 00:00129418632
25 Jan 2018 00:00126867522
26 Jan 2018 00:00120384169
27 Jan 2018 00:00107965025
28 Jan 2018 00:00115270802
29 Jan 2018 00:00130355607
30 Jan 2018 00:00130555501
31 Jan 2018 00:00129498048
1 Feb 2018 00:00126605496
2 Feb 2018 00:00123983716
3 Feb 2018 00:00111065036
4 Feb 2018 00:00115819500
5 Feb 2018 00:00132442241
6 Feb 2018 00:00136758552
7 Feb 2018 00:00139067668
8 Feb 2018 00:00139124509
9 Feb 2018 00:00134354204
10 Feb 2018 00:00121145171
11 Feb 2018 00:00127889728
12 Feb 2018 00:00140596687
13 Feb 2018 00:00138263086
14 Feb 2018 00:00138212012
15 Feb 2018 00:00136768187
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
13 Jun 2018 03:00261
13 Jun 2018 04:00271
13 Jun 2018 05:00272
13 Jun 2018 06:00270
13 Jun 2018 07:00273
13 Jun 2018 08:00306
13 Jun 2018 09:00308
13 Jun 2018 10:00271
13 Jun 2018 11:00271
13 Jun 2018 12:00268
13 Jun 2018 13:00269
13 Jun 2018 14:00271
13 Jun 2018 15:00273
13 Jun 2018 16:00264
13 Jun 2018 17:00291
13 Jun 2018 18:00272
13 Jun 2018 19:00276
13 Jun 2018 20:00292
13 Jun 2018 21:00274
13 Jun 2018 22:00271
13 Jun 2018 23:00268
14 Jun 2018 00:00269
14 Jun 2018 01:00270
14 Jun 2018 02:00262
14 Jun 2018 03:00274
14 Jun 2018 04:00263
14 Jun 2018 05:00280
14 Jun 2018 06:00267
14 Jun 2018 07:00245
14 Jun 2018 08:00250
14 Jun 2018 09:00235
14 Jun 2018 10:00267
14 Jun 2018 11:00249
14 Jun 2018 12:00259
14 Jun 2018 13:00258
14 Jun 2018 14:00267
14 Jun 2018 15:00247
14 Jun 2018 16:00243
14 Jun 2018 17:00253
14 Jun 2018 18:00239
14 Jun 2018 19:00248
14 Jun 2018 20:00244
14 Jun 2018 21:00275
14 Jun 2018 22:00255
14 Jun 2018 23:00249
15 Jun 2018 00:00258
15 Jun 2018 01:00252
15 Jun 2018 02:00268
15 Jun 2018 03:00256
15 Jun 2018 04:00258
15 Jun 2018 05:00262
15 Jun 2018 06:00282
15 Jun 2018 07:00271
15 Jun 2018 08:00278
15 Jun 2018 09:00292
15 Jun 2018 10:00276
15 Jun 2018 11:00534
15 Jun 2018 12:00270
15 Jun 2018 13:00277
15 Jun 2018 14:00271
15 Jun 2018 15:00271
15 Jun 2018 16:00271
15 Jun 2018 17:00273
15 Jun 2018 18:00284
15 Jun 2018 19:00265
15 Jun 2018 20:00273
15 Jun 2018 21:00265
15 Jun 2018 22:00273
15 Jun 2018 23:00270
16 Jun 2018 00:00274
16 Jun 2018 01:00277
16 Jun 2018 02:00281
16 Jun 2018 03:00273
16 Jun 2018 04:00269
16 Jun 2018 05:00271
16 Jun 2018 06:00274
16 Jun 2018 07:00270
16 Jun 2018 08:00276
16 Jun 2018 09:00267
16 Jun 2018 10:00269
16 Jun 2018 11:00273
16 Jun 2018 12:00263
16 Jun 2018 13:00273
16 Jun 2018 14:00269
16 Jun 2018 15:00274
16 Jun 2018 16:00275
16 Jun 2018 17:00282
16 Jun 2018 18:00282
16 Jun 2018 19:00270
16 Jun 2018 20:00271
16 Jun 2018 21:00286
16 Jun 2018 22:00279
16 Jun 2018 23:00265
17 Jun 2018 00:00269
17 Jun 2018 01:00264
17 Jun 2018 02:00275
17 Jun 2018 03:00269
17 Jun 2018 04:00267
17 Jun 2018 05:00272
17 Jun 2018 06:00283
17 Jun 2018 07:00281
17 Jun 2018 08:00279
17 Jun 2018 09:00272
17 Jun 2018 10:00279
17 Jun 2018 11:00270
17 Jun 2018 12:00278
17 Jun 2018 13:00283
17 Jun 2018 14:00273
17 Jun 2018 15:00280
17 Jun 2018 16:00276
17 Jun 2018 17:00291
17 Jun 2018 18:00269
17 Jun 2018 19:00262
17 Jun 2018 20:00276
17 Jun 2018 21:00275
17 Jun 2018 22:00291
17 Jun 2018 23:00273
18 Jun 2018 00:00265
18 Jun 2018 01:00276
18 Jun 2018 02:00267
18 Jun 2018 03:00273
18 Jun 2018 04:00271
18 Jun 2018 05:00274
18 Jun 2018 06:00270
18 Jun 2018 07:00275
18 Jun 2018 08:00275
18 Jun 2018 09:00279
18 Jun 2018 10:00274
18 Jun 2018 11:00276
18 Jun 2018 12:00274
18 Jun 2018 13:00277
18 Jun 2018 14:00272
18 Jun 2018 15:00279
18 Jun 2018 16:00275
18 Jun 2018 17:00275
18 Jun 2018 18:00276
18 Jun 2018 19:00284
18 Jun 2018 20:00276
18 Jun 2018 21:00268
18 Jun 2018 22:00264
18 Jun 2018 23:00265
19 Jun 2018 00:00263
19 Jun 2018 01:00265
19 Jun 2018 02:00271
19 Jun 2018 03:00259
19 Jun 2018 04:00251
19 Jun 2018 05:00243
19 Jun 2018 06:00241
19 Jun 2018 07:00251
19 Jun 2018 08:00239
19 Jun 2018 09:00245
19 Jun 2018 10:00246
19 Jun 2018 11:00256
19 Jun 2018 12:00246
19 Jun 2018 13:00250
19 Jun 2018 14:00246
19 Jun 2018 15:00246
19 Jun 2018 16:00239
19 Jun 2018 17:00261
19 Jun 2018 18:00254
19 Jun 2018 19:00238
19 Jun 2018 20:00266
19 Jun 2018 21:00258
19 Jun 2018 22:00247
19 Jun 2018 23:00238
20 Jun 2018 00:00237
20 Jun 2018 01:00245
20 Jun 2018 02:00243
20 Jun 2018 03:00258

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1085935262
Misses7179399

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.