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
25 Jan 2017 00:0035619948
26 Jan 2017 00:0036071213
27 Jan 2017 00:0032465983
28 Jan 2017 00:0026966448
29 Jan 2017 00:0029740069
30 Jan 2017 00:0036063509
31 Jan 2017 00:0036152486
1 Feb 2017 00:0038016618
2 Feb 2017 00:0038092744
3 Feb 2017 00:0036796339
4 Feb 2017 00:0032491273
5 Feb 2017 00:0032453018
6 Feb 2017 00:0036860319
7 Feb 2017 00:0035571731
8 Feb 2017 00:0036412197
9 Feb 2017 00:0036514897
10 Feb 2017 00:0033490604
11 Feb 2017 00:0027995607
12 Feb 2017 00:0029223036
13 Feb 2017 00:0036885381
14 Feb 2017 00:0035887992
15 Feb 2017 00:0038363219
16 Feb 2017 00:0038642420
17 Feb 2017 00:0034407156
18 Feb 2017 00:0028874822
19 Feb 2017 00:0030971428
20 Feb 2017 00:0037275115
21 Feb 2017 00:0038420294
22 Feb 2017 00:0037623473
23 Feb 2017 00:0039089757
24 Feb 2017 00:0036219130
25 Feb 2017 00:0034519605
26 Feb 2017 00:0035891521
27 Feb 2017 00:0043712007
28 Feb 2017 00:0045064797
1 Mar 2017 00:0045392374
2 Mar 2017 00:0046631873
3 Mar 2017 00:0042165614
4 Mar 2017 00:0037713394
5 Mar 2017 00:0039805594
6 Mar 2017 00:0046066982
7 Mar 2017 00:0045176879
8 Mar 2017 00:0044774385
9 Mar 2017 00:0047826146
10 Mar 2017 00:0045210137
11 Mar 2017 00:0037960796
12 Mar 2017 00:0038080093
13 Mar 2017 00:0044997769
14 Mar 2017 00:0044341787
15 Mar 2017 00:0045435363
16 Mar 2017 00:0046967559
17 Mar 2017 00:0043404160
18 Mar 2017 00:0038636175
19 Mar 2017 00:0040990946
20 Mar 2017 00:0046873678
21 Mar 2017 00:0046191872
22 Mar 2017 00:0054879586
23 Mar 2017 00:0051247835
24 Mar 2017 00:0043630492
25 Mar 2017 00:0037657863
26 Mar 2017 00:0038374304
27 Mar 2017 00:0046018476
28 Mar 2017 00:0047087794
29 Mar 2017 00:0050447958
30 Mar 2017 00:0051112994
31 Mar 2017 00:0047293919
1 Apr 2017 00:0041000670
2 Apr 2017 00:0043531550
3 Apr 2017 00:0051512891
4 Apr 2017 00:0051372073
5 Apr 2017 00:0054481975
6 Apr 2017 00:0056145273
7 Apr 2017 00:0052098787
8 Apr 2017 00:0043880878
9 Apr 2017 00:0045799887
10 Apr 2017 00:0053918800
11 Apr 2017 00:0052654208
12 Apr 2017 00:0052502250
13 Apr 2017 00:0054089240
14 Apr 2017 00:0046311543
15 Apr 2017 00:0041134631
16 Apr 2017 00:0041256184
17 Apr 2017 00:0049758481
18 Apr 2017 00:0052956422
19 Apr 2017 00:0062803694
20 Apr 2017 00:0057519252
21 Apr 2017 00:0052213352
22 Apr 2017 00:0044706951
23 Apr 2017 00:0046211183
24 Apr 2017 00:0051760510
25 Apr 2017 00:0052904021
26 Apr 2017 00:0054639242
27 Apr 2017 00:0054814559
28 Apr 2017 00:0049165192
29 Apr 2017 00:0041450175
30 Apr 2017 00:0042086729
1 May 2017 00:0048927702
2 May 2017 00:0052240395
3 May 2017 00:0054854825
4 May 2017 00:0056176590
5 May 2017 00:0049582172
6 May 2017 00:0042364406
7 May 2017 00:0045425783
8 May 2017 00:0055427229
9 May 2017 00:0053459291
10 May 2017 00:0058407788
11 May 2017 00:0055479307
12 May 2017 00:0052323298
13 May 2017 00:0046430394
14 May 2017 00:0046762851
15 May 2017 00:0072273424
16 May 2017 00:00122376199
17 May 2017 00:00146982847
18 May 2017 00:00149453129
19 May 2017 00:00132430263
20 May 2017 00:00103930642
21 May 2017 00:00113328523
22 May 2017 00:00156497089
23 May 2017 00:00204259789
24 May 2017 00:00185528805
25 May 2017 00:00190866187
26 May 2017 00:00177348224
27 May 2017 00:00151034285
28 May 2017 00:00154511357
29 May 2017 00:00169294032
30 May 2017 00:00180873768
31 May 2017 00:00190869991
1 Jun 2017 00:00169455839
2 Jun 2017 00:00163791749
3 Jun 2017 00:00142710187
4 Jun 2017 00:00154835578
5 Jun 2017 00:00181687513
6 Jun 2017 00:00187751090
7 Jun 2017 00:00188375967
8 Jun 2017 00:00198527143
9 Jun 2017 00:00199642900
10 Jun 2017 00:00165399690
11 Jun 2017 00:00171181932
12 Jun 2017 00:00134713967
13 Jun 2017 00:0090394163
14 Jun 2017 00:0092045891
15 Jun 2017 00:0086400871
16 Jun 2017 00:0080624872
17 Jun 2017 00:0068688951
18 Jun 2017 00:0070718368
19 Jun 2017 00:00162513297
20 Jun 2017 00:00211093795
21 Jun 2017 00:00214219084
22 Jun 2017 00:00174840445
23 Jun 2017 00:0086753741
24 Jun 2017 00:0070242997
25 Jun 2017 00:0069177924
26 Jun 2017 00:0078998035
27 Jun 2017 00:0080757503
28 Jun 2017 00:0082044197
29 Jun 2017 00:0087612832
30 Jun 2017 00:00143821709
1 Jul 2017 00:00166411953
2 Jul 2017 00:00157919657
3 Jul 2017 00:00182122476
4 Jul 2017 00:00181211078
5 Jul 2017 00:00195342945
6 Jul 2017 00:00213234714
7 Jul 2017 00:00197551078
8 Jul 2017 00:00171079145
9 Jul 2017 00:00172915769
10 Jul 2017 00:00207187862
11 Jul 2017 00:00163444791
12 Jul 2017 00:0086076994
13 Jul 2017 00:0077640520
14 Jul 2017 00:0076983527
15 Jul 2017 00:0067177176
16 Jul 2017 00:0066752984
17 Jul 2017 00:0076652669
18 Jul 2017 00:00123191239
19 Jul 2017 00:00201484890
20 Jul 2017 00:00202451280
21 Jul 2017 00:00191095482
22 Jul 2017 00:00175410388
23 Jul 2017 00:00180460884

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
17 Jul 2017 09:00319
17 Jul 2017 10:00340
17 Jul 2017 11:00362
17 Jul 2017 12:00351
17 Jul 2017 13:00355
17 Jul 2017 14:00336
17 Jul 2017 15:00308
17 Jul 2017 16:00331
17 Jul 2017 17:00319
17 Jul 2017 18:00325
17 Jul 2017 19:00341
17 Jul 2017 20:00325
17 Jul 2017 21:00314
17 Jul 2017 22:00314
17 Jul 2017 23:00311
18 Jul 2017 00:00318
18 Jul 2017 01:00329
18 Jul 2017 02:00327
18 Jul 2017 03:00308
18 Jul 2017 04:00319
18 Jul 2017 05:00327
18 Jul 2017 06:00334
18 Jul 2017 07:00325
18 Jul 2017 08:00326
18 Jul 2017 09:00316
18 Jul 2017 10:00324
18 Jul 2017 11:00311
18 Jul 2017 12:00321
18 Jul 2017 13:00309
18 Jul 2017 14:00336
18 Jul 2017 15:00327
18 Jul 2017 16:00329
18 Jul 2017 17:00335
18 Jul 2017 18:00343
18 Jul 2017 19:00330
18 Jul 2017 20:00330
18 Jul 2017 21:00332
18 Jul 2017 22:00328
18 Jul 2017 23:00325
19 Jul 2017 00:00335
19 Jul 2017 01:00323
19 Jul 2017 02:00329
19 Jul 2017 03:00341
19 Jul 2017 04:00341
19 Jul 2017 05:00329
19 Jul 2017 06:00340
19 Jul 2017 07:00329
19 Jul 2017 08:00320
19 Jul 2017 09:00333
19 Jul 2017 10:00329
19 Jul 2017 11:00338
19 Jul 2017 12:00356
19 Jul 2017 13:00342
19 Jul 2017 14:00326
19 Jul 2017 15:00326
19 Jul 2017 16:00336
19 Jul 2017 17:00328
19 Jul 2017 18:00331
19 Jul 2017 19:00333
19 Jul 2017 20:00334
19 Jul 2017 21:00332
19 Jul 2017 22:00355
19 Jul 2017 23:00332
20 Jul 2017 00:00328
20 Jul 2017 01:00345
20 Jul 2017 02:00334
20 Jul 2017 03:00353
20 Jul 2017 04:00353
20 Jul 2017 05:00364
20 Jul 2017 06:00375
20 Jul 2017 07:00371
20 Jul 2017 08:00350
20 Jul 2017 09:00344
20 Jul 2017 10:00352
20 Jul 2017 11:00346
20 Jul 2017 12:00352
20 Jul 2017 13:00368
20 Jul 2017 14:00348
20 Jul 2017 15:00343
20 Jul 2017 16:00347
20 Jul 2017 17:00356
20 Jul 2017 18:00365
20 Jul 2017 19:00356
20 Jul 2017 20:00351
20 Jul 2017 21:00353
20 Jul 2017 22:00343
20 Jul 2017 23:00347
21 Jul 2017 00:00342
21 Jul 2017 01:00348
21 Jul 2017 02:00346
21 Jul 2017 03:00342
21 Jul 2017 04:00354
21 Jul 2017 05:00350
21 Jul 2017 06:00348
21 Jul 2017 07:00349
21 Jul 2017 08:00343
21 Jul 2017 09:00355
21 Jul 2017 10:00349
21 Jul 2017 11:00349
21 Jul 2017 12:00343
21 Jul 2017 13:00351
21 Jul 2017 14:00369
21 Jul 2017 15:00370
21 Jul 2017 16:00360
21 Jul 2017 17:00358
21 Jul 2017 18:00371
21 Jul 2017 19:00377
21 Jul 2017 20:00362
21 Jul 2017 21:00358
21 Jul 2017 22:00356
21 Jul 2017 23:00351
22 Jul 2017 00:00354
22 Jul 2017 01:00359
22 Jul 2017 02:00367
22 Jul 2017 03:00357
22 Jul 2017 04:00359
22 Jul 2017 05:00366
22 Jul 2017 06:00363
22 Jul 2017 07:00367
22 Jul 2017 08:00343
22 Jul 2017 09:00369
22 Jul 2017 10:00361
22 Jul 2017 11:00358
22 Jul 2017 12:00373
22 Jul 2017 13:00372
22 Jul 2017 14:00352
22 Jul 2017 15:00357
22 Jul 2017 16:00369
22 Jul 2017 17:00397
22 Jul 2017 18:00376
22 Jul 2017 19:00361
22 Jul 2017 20:00355
22 Jul 2017 21:00382
22 Jul 2017 22:00367
22 Jul 2017 23:00379
23 Jul 2017 00:00360
23 Jul 2017 01:00365
23 Jul 2017 02:00352
23 Jul 2017 03:00388
23 Jul 2017 04:00353
23 Jul 2017 05:00354
23 Jul 2017 06:00350
23 Jul 2017 07:00341
23 Jul 2017 08:00361
23 Jul 2017 09:00341
23 Jul 2017 10:00352
23 Jul 2017 11:00352
23 Jul 2017 12:00335
23 Jul 2017 13:00352
23 Jul 2017 14:00349
23 Jul 2017 15:00356
23 Jul 2017 16:00373
23 Jul 2017 17:00345
23 Jul 2017 18:00343
23 Jul 2017 19:00337
23 Jul 2017 20:00348
23 Jul 2017 21:00361
23 Jul 2017 22:00361
23 Jul 2017 23:00326
24 Jul 2017 00:00337
24 Jul 2017 01:00337
24 Jul 2017 02:00354
24 Jul 2017 03:00339
24 Jul 2017 04:00344
24 Jul 2017 05:00338
24 Jul 2017 06:00328
24 Jul 2017 07:00334
24 Jul 2017 08:00294
24 Jul 2017 09:00312

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits1127913809
Misses4135206

Availability

Total downtime, according to Pingdom:

Last 30 daysNone
Last 3 monthsNone
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.

Network performance in detail

95th percentile and median resource timing metrics, broken down by Fastly edge point of presence, measured using the resource timing API from live polyfill service requests that opted in to anonymously report performance data. Last 30 days, showing only POPs that have served more than 10000 RUM-enabled requests.

PoP Sample Per connection phase (95th percentile and median) Overall

Only non-zero samples are counted, which in practice means there are far fewer DNS lookup and TCP connect datapoints, because if reusing a keep-alive connection, both will be zero. Timings for individual connection phases do not sum to the overall RTT because, for example, the request that exhibits the 95th percentile DNS time, will most likely not also be the 95th percentile on all other connection metrics.

Typically Polyfill.io is loaded at a point where the browser is very busy. To speed up loading, consider using preconnect or preload.