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
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
20 Jun 2018 00:00166979695
21 Jun 2018 00:00171977054
22 Jun 2018 00:00168506443
23 Jun 2018 00:00153190235

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
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 03:00243
20 Jun 2018 04:00253
20 Jun 2018 05:00267
20 Jun 2018 06:00246
20 Jun 2018 07:00258
20 Jun 2018 08:00253
20 Jun 2018 09:00244
20 Jun 2018 10:00241
20 Jun 2018 11:00243
20 Jun 2018 12:00245
20 Jun 2018 13:00255
20 Jun 2018 14:00246
20 Jun 2018 15:00249
20 Jun 2018 16:00245
20 Jun 2018 17:00280
20 Jun 2018 18:00253
20 Jun 2018 19:00271
20 Jun 2018 20:00268
20 Jun 2018 21:00273
20 Jun 2018 22:00271
20 Jun 2018 23:00291
21 Jun 2018 00:00297
21 Jun 2018 01:00267
21 Jun 2018 02:00271
21 Jun 2018 03:00274
21 Jun 2018 04:00278
21 Jun 2018 05:00274
21 Jun 2018 06:00269
21 Jun 2018 07:00268
21 Jun 2018 08:00278
21 Jun 2018 09:00279
21 Jun 2018 10:00273
21 Jun 2018 11:00283
21 Jun 2018 12:00278
21 Jun 2018 13:00281
21 Jun 2018 14:00299
21 Jun 2018 15:00273
21 Jun 2018 16:00286
21 Jun 2018 17:00283
21 Jun 2018 18:00292
21 Jun 2018 19:00287
21 Jun 2018 20:00299
21 Jun 2018 21:00312
21 Jun 2018 22:00272
21 Jun 2018 23:00279
22 Jun 2018 00:00253
22 Jun 2018 01:00262
22 Jun 2018 02:00249
22 Jun 2018 03:00254
22 Jun 2018 04:00260
22 Jun 2018 05:00254
22 Jun 2018 06:00258
22 Jun 2018 07:00263
22 Jun 2018 08:00266
22 Jun 2018 09:00259
22 Jun 2018 10:00259
22 Jun 2018 11:00261
22 Jun 2018 12:00256
22 Jun 2018 13:00261
22 Jun 2018 14:00258
22 Jun 2018 15:00249
22 Jun 2018 16:00258
22 Jun 2018 17:00259
22 Jun 2018 18:00261
22 Jun 2018 19:00254
22 Jun 2018 20:00260
22 Jun 2018 21:00259
22 Jun 2018 22:00267
22 Jun 2018 23:00259
23 Jun 2018 00:00269
23 Jun 2018 01:00269
23 Jun 2018 02:00258
23 Jun 2018 03:00258
23 Jun 2018 04:00251
23 Jun 2018 05:00256
23 Jun 2018 06:00259
23 Jun 2018 07:00254
23 Jun 2018 08:00258
23 Jun 2018 09:00267
23 Jun 2018 10:00248
23 Jun 2018 11:00265
23 Jun 2018 12:00254
23 Jun 2018 13:00254
23 Jun 2018 14:00263
23 Jun 2018 15:00258
23 Jun 2018 16:00254
23 Jun 2018 17:00253
23 Jun 2018 18:00274
23 Jun 2018 19:00265
23 Jun 2018 20:00260
23 Jun 2018 21:00270
23 Jun 2018 22:00255
23 Jun 2018 23:00265
24 Jun 2018 00:00266
24 Jun 2018 01:00254
24 Jun 2018 02:00257
24 Jun 2018 03:00260
24 Jun 2018 04:00263
24 Jun 2018 05:00256
24 Jun 2018 06:00255
24 Jun 2018 07:00268
24 Jun 2018 08:00260
24 Jun 2018 09:00266
24 Jun 2018 10:00259
24 Jun 2018 11:00257
24 Jun 2018 12:00262
24 Jun 2018 13:00261
24 Jun 2018 14:00265
24 Jun 2018 15:00258
24 Jun 2018 16:00259

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1115883594
Misses6952369

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.