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
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
23 Nov 2017 00:008344
24 Nov 2017 00:009300
25 Nov 2017 00:008822
26 Nov 2017 00:007991
27 Nov 2017 00:008845
28 Nov 2017 00:008101
29 Nov 2017 00:007128
30 Nov 2017 00:005817
1 Dec 2017 00:0015567
2 Dec 2017 00:0021537
3 Dec 2017 00:0022818
4 Dec 2017 00:0022241
5 Dec 2017 00:0030284
6 Dec 2017 00:0030321
7 Dec 2017 00:0022847
8 Dec 2017 00:0022732
9 Dec 2017 00:0022808
10 Dec 2017 00:0022491
11 Dec 2017 00:0021144
12 Dec 2017 00:0025768
13 Dec 2017 00:0023905
14 Dec 2017 00:0020555
15 Dec 2017 00:0019081
16 Dec 2017 00:0018515
17 Dec 2017 00:0018654
18 Dec 2017 00:0020420
19 Dec 2017 00:0026129
20 Dec 2017 00:0016734
21 Dec 2017 00:0019287
22 Dec 2017 00:0015958
23 Dec 2017 00:0017069
24 Dec 2017 00:0019002
25 Dec 2017 00:0015732
26 Dec 2017 00:0028213
27 Dec 2017 00:0015392
28 Dec 2017 00:0017904
29 Dec 2017 00:0034888
30 Dec 2017 00:0016706
31 Dec 2017 00:006707
1 Jan 2018 00:005632
2 Jan 2018 00:0010641
3 Jan 2018 00:006840
4 Jan 2018 00:007508
5 Jan 2018 00:008670
6 Jan 2018 00:006936
7 Jan 2018 00:0010064
8 Jan 2018 00:008706
9 Jan 2018 00:008389
10 Jan 2018 00:008837
11 Jan 2018 00:008471
12 Jan 2018 00:0010868
13 Jan 2018 00:009740
14 Jan 2018 00:008403
15 Jan 2018 00:009459
16 Jan 2018 00:008729
17 Jan 2018 00:009291
18 Jan 2018 00:009173
19 Jan 2018 00:009380
20 Jan 2018 00:009737
21 Jan 2018 00:008458
22 Jan 2018 00:009067
23 Jan 2018 00:008508
24 Jan 2018 00:008939
25 Jan 2018 00:008471
26 Jan 2018 00:009966
27 Jan 2018 00:009285
28 Jan 2018 00:008886
29 Jan 2018 00:0012254
30 Jan 2018 00:0012351
31 Jan 2018 00:0015165
1 Feb 2018 00:009900
2 Feb 2018 00:0010412
3 Feb 2018 00:009329
4 Feb 2018 00:009796
5 Feb 2018 00:009899
6 Feb 2018 00:0010055
7 Feb 2018 00:0094324
8 Feb 2018 00:00114891
9 Feb 2018 00:0073727
10 Feb 2018 00:0063576
11 Feb 2018 00:0051231
12 Feb 2018 00:0033918
13 Feb 2018 00:0013188
14 Feb 2018 00:0030890
15 Feb 2018 00:0011399
16 Feb 2018 00:0013417
17 Feb 2018 00:009987
18 Feb 2018 00:0010937
19 Feb 2018 00:009923
20 Feb 2018 00:009160
21 Feb 2018 00:0010059
22 Feb 2018 00:009344
23 Feb 2018 00:008958
24 Feb 2018 00:007862
25 Feb 2018 00:007769
26 Feb 2018 00:007857
27 Feb 2018 00:007375
28 Feb 2018 00:007528
1 Mar 2018 00:007801
2 Mar 2018 00:007739
3 Mar 2018 00:007760
4 Mar 2018 00:007919
5 Mar 2018 00:007663
6 Mar 2018 00:0011937
7 Mar 2018 00:0012225
8 Mar 2018 00:0011806
9 Mar 2018 00:0012207
10 Mar 2018 00:0012069
11 Mar 2018 00:0011573
12 Mar 2018 00:0014972
13 Mar 2018 00:0012686
14 Mar 2018 00:0012676
15 Mar 2018 00:0058739
16 Mar 2018 00:0079366
17 Mar 2018 00:0057707
18 Mar 2018 00:0043102
19 Mar 2018 00:0023316
20 Mar 2018 00:009409
21 Mar 2018 00:008972
22 Mar 2018 00:008418
23 Mar 2018 00:008573
24 Mar 2018 00:008901
25 Mar 2018 00:008116
26 Mar 2018 00:009866
27 Mar 2018 00:008190
28 Mar 2018 00:008471
29 Mar 2018 00:009495
30 Mar 2018 00:0010026
31 Mar 2018 00:009083
1 Apr 2018 00:007798
2 Apr 2018 00:007387
3 Apr 2018 00:007659
4 Apr 2018 00:008756
5 Apr 2018 00:007474
6 Apr 2018 00:007427
7 Apr 2018 00:006889
8 Apr 2018 00:007013
9 Apr 2018 00:007970
10 Apr 2018 00:008480
11 Apr 2018 00:008266
12 Apr 2018 00:008702
13 Apr 2018 00:009187
14 Apr 2018 00:008401
15 Apr 2018 00:008122
16 Apr 2018 00:008741
17 Apr 2018 00:007868
18 Apr 2018 00:008080
19 Apr 2018 00:008398
20 Apr 2018 00:008796
21 Apr 2018 00:007834

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
15 Apr 2018 12:00327
15 Apr 2018 13:00356
15 Apr 2018 14:00363
15 Apr 2018 15:00352
15 Apr 2018 16:00355
15 Apr 2018 17:00357
15 Apr 2018 18:00348
15 Apr 2018 19:00353
15 Apr 2018 20:00364
15 Apr 2018 21:00354
15 Apr 2018 22:00359
15 Apr 2018 23:00361
16 Apr 2018 00:00359
16 Apr 2018 01:00350
16 Apr 2018 02:00354
16 Apr 2018 03:00321
16 Apr 2018 04:00323
16 Apr 2018 05:00325
16 Apr 2018 06:00297
16 Apr 2018 07:00293
16 Apr 2018 08:00291
16 Apr 2018 09:00293
16 Apr 2018 10:00290
16 Apr 2018 11:00283
16 Apr 2018 12:00306
16 Apr 2018 13:00297
16 Apr 2018 14:00295
16 Apr 2018 15:00285
16 Apr 2018 16:00283
16 Apr 2018 17:00296
16 Apr 2018 18:00293
16 Apr 2018 19:00296
16 Apr 2018 20:00288
16 Apr 2018 21:00288
16 Apr 2018 22:00293
16 Apr 2018 23:00296
17 Apr 2018 00:00279
17 Apr 2018 01:00305
17 Apr 2018 02:00302
17 Apr 2018 03:00305
17 Apr 2018 04:00304
17 Apr 2018 05:00315
17 Apr 2018 06:00307
17 Apr 2018 07:00303
17 Apr 2018 08:00312
17 Apr 2018 09:00313
17 Apr 2018 10:00307
17 Apr 2018 11:00316
17 Apr 2018 12:00318
17 Apr 2018 13:00324
17 Apr 2018 14:00320
17 Apr 2018 15:00324
17 Apr 2018 16:00327
17 Apr 2018 17:00307
17 Apr 2018 18:00322
17 Apr 2018 19:00313
17 Apr 2018 20:00309
17 Apr 2018 21:00317
17 Apr 2018 22:00320
17 Apr 2018 23:00315
18 Apr 2018 00:00316
18 Apr 2018 01:00314
18 Apr 2018 02:00306
18 Apr 2018 03:00315
18 Apr 2018 04:00315
18 Apr 2018 05:00312
18 Apr 2018 06:00303
18 Apr 2018 07:00311
18 Apr 2018 08:00309
18 Apr 2018 09:00303
18 Apr 2018 10:00303
18 Apr 2018 11:00308
18 Apr 2018 12:00309
18 Apr 2018 13:00308
18 Apr 2018 14:00307
18 Apr 2018 15:00329
18 Apr 2018 16:00302
18 Apr 2018 17:00315
18 Apr 2018 18:00313
18 Apr 2018 19:00301
18 Apr 2018 20:00305
18 Apr 2018 21:00294
18 Apr 2018 22:00306
18 Apr 2018 23:00330
19 Apr 2018 00:00302
19 Apr 2018 01:00295
19 Apr 2018 02:00307
19 Apr 2018 03:00291
19 Apr 2018 04:00304
19 Apr 2018 05:00300
19 Apr 2018 06:00299
19 Apr 2018 07:00310
19 Apr 2018 08:00300
19 Apr 2018 09:00305
19 Apr 2018 10:00304
19 Apr 2018 11:00302
19 Apr 2018 12:00301
19 Apr 2018 13:00307
19 Apr 2018 14:00310
19 Apr 2018 15:00316
19 Apr 2018 16:00427
19 Apr 2018 17:00304
19 Apr 2018 18:00296
19 Apr 2018 19:00296
19 Apr 2018 20:00290
19 Apr 2018 21:00299
19 Apr 2018 22:00288
19 Apr 2018 23:00290
20 Apr 2018 00:00308
20 Apr 2018 01:00311
20 Apr 2018 02:00301
20 Apr 2018 03:00301
20 Apr 2018 04:00299
20 Apr 2018 05:00304
20 Apr 2018 06:00322
20 Apr 2018 07:00299
20 Apr 2018 08:00307
20 Apr 2018 09:00317
20 Apr 2018 10:00298
20 Apr 2018 11:00300
20 Apr 2018 12:00290
20 Apr 2018 13:00296
20 Apr 2018 14:00285
20 Apr 2018 15:00294
20 Apr 2018 16:00287
20 Apr 2018 17:00307
20 Apr 2018 18:00295
20 Apr 2018 19:00283
20 Apr 2018 20:00284
20 Apr 2018 21:00286
20 Apr 2018 22:00299
20 Apr 2018 23:00281
21 Apr 2018 00:00279
21 Apr 2018 01:00302
21 Apr 2018 02:00287
21 Apr 2018 03:00286
21 Apr 2018 04:00277
21 Apr 2018 05:00288
21 Apr 2018 06:00290
21 Apr 2018 07:00282
21 Apr 2018 08:00286
21 Apr 2018 09:00282
21 Apr 2018 10:00301
21 Apr 2018 11:00290
21 Apr 2018 12:00295
21 Apr 2018 13:00293
21 Apr 2018 14:00292
21 Apr 2018 15:00283
21 Apr 2018 16:00301
21 Apr 2018 17:00283
21 Apr 2018 18:00290
21 Apr 2018 19:00291
21 Apr 2018 20:00289
21 Apr 2018 21:00295
21 Apr 2018 22:00293
21 Apr 2018 23:00296
22 Apr 2018 00:00298
22 Apr 2018 01:00301
22 Apr 2018 02:00296
22 Apr 2018 03:00293
22 Apr 2018 04:00290
22 Apr 2018 05:00295
22 Apr 2018 06:00297
22 Apr 2018 07:00299
22 Apr 2018 08:00306
22 Apr 2018 09:00314
22 Apr 2018 10:00314
22 Apr 2018 11:00301
22 Apr 2018 12:00311

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits53914
Misses3523

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.