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
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
22 Apr 2018 00:008309
23 Apr 2018 00:008747
24 Apr 2018 00:008891
25 Apr 2018 00:008803
26 Apr 2018 00:008383
27 Apr 2018 00:008378
28 Apr 2018 00:007890
29 Apr 2018 00:007819
30 Apr 2018 00:008076
1 May 2018 00:008580
2 May 2018 00:007510
3 May 2018 00:007447
4 May 2018 00:007343
5 May 2018 00:006611
6 May 2018 00:009007
7 May 2018 00:007775
8 May 2018 00:007548
9 May 2018 00:008477
10 May 2018 00:006867
11 May 2018 00:006842
12 May 2018 00:005682
13 May 2018 00:005731
14 May 2018 00:007353
15 May 2018 00:007702
16 May 2018 00:0010005
17 May 2018 00:0010226
18 May 2018 00:009266
19 May 2018 00:007852
20 May 2018 00:007904
21 May 2018 00:008849
22 May 2018 00:0014745
23 May 2018 00:0016691
24 May 2018 00:0023918
25 May 2018 00:0028519
26 May 2018 00:0021946
27 May 2018 00:0024006
28 May 2018 00:0027101
29 May 2018 00:0026932
30 May 2018 00:0025220
31 May 2018 00:0029308
1 Jun 2018 00:0030104
2 Jun 2018 00:0022936
3 Jun 2018 00:0019571
4 Jun 2018 00:0022229
5 Jun 2018 00:0022827
6 Jun 2018 00:0022573
7 Jun 2018 00:0023157
8 Jun 2018 00:0026419
9 Jun 2018 00:0020382
10 Jun 2018 00:0025752
11 Jun 2018 00:0024747
12 Jun 2018 00:0026133
13 Jun 2018 00:0028689
14 Jun 2018 00:0030262
15 Jun 2018 00:0030920
16 Jun 2018 00:0024155
17 Jun 2018 00:0029086
18 Jun 2018 00:0029278
19 Jun 2018 00:0027827
20 Jun 2018 00:0024842
21 Jun 2018 00:0028794
22 Jun 2018 00:0028040
23 Jun 2018 00:0020122
24 Jun 2018 00:0023176
25 Jun 2018 00:0025121
26 Jun 2018 00:0025399
27 Jun 2018 00:0025532
28 Jun 2018 00:0022885
29 Jun 2018 00:0023943
30 Jun 2018 00:0020502
1 Jul 2018 00:0021396
2 Jul 2018 00:0021826
3 Jul 2018 00:0021047
4 Jul 2018 00:0022785
5 Jul 2018 00:0020137
6 Jul 2018 00:0018637
7 Jul 2018 00:0016265
8 Jul 2018 00:0017198
9 Jul 2018 00:0022051
10 Jul 2018 00:0025484
11 Jul 2018 00:0019579
12 Jul 2018 00:0020708
13 Jul 2018 00:0021952
14 Jul 2018 00:0016455
15 Jul 2018 00:0016252
16 Jul 2018 00:0024980
17 Jul 2018 00:0020073
18 Jul 2018 00:0020269
19 Jul 2018 00:0019503
20 Jul 2018 00:0018509
21 Jul 2018 00:0016431
22 Jul 2018 00:0018273
23 Jul 2018 00:0022395
24 Jul 2018 00:0028701
25 Jul 2018 00:0023318
26 Jul 2018 00:0022512
27 Jul 2018 00:0022293
28 Jul 2018 00:0020027
29 Jul 2018 00:0019383
30 Jul 2018 00:0026819
31 Jul 2018 00:0023418
1 Aug 2018 00:0024186
2 Aug 2018 00:0020032
3 Aug 2018 00:0025314
4 Aug 2018 00:0034132
5 Aug 2018 00:0039801
6 Aug 2018 00:0032854
7 Aug 2018 00:0025941
8 Aug 2018 00:0038421
9 Aug 2018 00:0028920
10 Aug 2018 00:0024828
11 Aug 2018 00:0022365
12 Aug 2018 00:0021893
13 Aug 2018 00:0030233
14 Aug 2018 00:0037801
15 Aug 2018 00:0030376
16 Aug 2018 00:0027511
17 Aug 2018 00:0028191
18 Aug 2018 00:0024327
19 Aug 2018 00:0028331

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
13 Aug 2018 11:00374
13 Aug 2018 12:00376
13 Aug 2018 13:00488
13 Aug 2018 14:00442
13 Aug 2018 15:00622
13 Aug 2018 16:00409
13 Aug 2018 17:00479
13 Aug 2018 18:00564
13 Aug 2018 19:00422
13 Aug 2018 20:00549
13 Aug 2018 21:00412
13 Aug 2018 22:00393
13 Aug 2018 23:00403
14 Aug 2018 00:00392
14 Aug 2018 01:00409
14 Aug 2018 02:00398
14 Aug 2018 03:00390
14 Aug 2018 04:00404
14 Aug 2018 05:00406
14 Aug 2018 06:00409
14 Aug 2018 07:00400
14 Aug 2018 08:00409
14 Aug 2018 09:00394
14 Aug 2018 10:00397
14 Aug 2018 11:00437
14 Aug 2018 12:00394
14 Aug 2018 13:00375
14 Aug 2018 14:00381
14 Aug 2018 15:00389
14 Aug 2018 16:00472
14 Aug 2018 17:00377
14 Aug 2018 18:00397
14 Aug 2018 19:00378
14 Aug 2018 20:00369
14 Aug 2018 21:00379
14 Aug 2018 22:00373
14 Aug 2018 23:00388
15 Aug 2018 00:00381
15 Aug 2018 01:00372
15 Aug 2018 02:00396
15 Aug 2018 03:00524
15 Aug 2018 04:00409
15 Aug 2018 05:00435
15 Aug 2018 06:00370
15 Aug 2018 07:00379
15 Aug 2018 08:00379
15 Aug 2018 09:00369
15 Aug 2018 10:00377
15 Aug 2018 11:00378
15 Aug 2018 12:00375
15 Aug 2018 13:00377
15 Aug 2018 14:00432
15 Aug 2018 15:00369
15 Aug 2018 16:00549
15 Aug 2018 17:00623
15 Aug 2018 18:00581
15 Aug 2018 19:00418
15 Aug 2018 20:00513
15 Aug 2018 21:00424
15 Aug 2018 22:00418
15 Aug 2018 23:00418
16 Aug 2018 00:00408
16 Aug 2018 01:00422
16 Aug 2018 02:00420
16 Aug 2018 03:00389
16 Aug 2018 04:00401
16 Aug 2018 05:00434
16 Aug 2018 06:00393
16 Aug 2018 07:00387
16 Aug 2018 08:00398
16 Aug 2018 09:00399
16 Aug 2018 10:00400
16 Aug 2018 11:00403
16 Aug 2018 12:00409
16 Aug 2018 13:00407
16 Aug 2018 14:00409
16 Aug 2018 15:00409
16 Aug 2018 16:00475
16 Aug 2018 17:00413
16 Aug 2018 18:00401
16 Aug 2018 19:00408
16 Aug 2018 20:00417
16 Aug 2018 21:00401
16 Aug 2018 22:00404
16 Aug 2018 23:00413
17 Aug 2018 00:00407
17 Aug 2018 01:00402
17 Aug 2018 02:00403
17 Aug 2018 03:00402
17 Aug 2018 04:00409
17 Aug 2018 05:00425
17 Aug 2018 06:00414
17 Aug 2018 07:00404
17 Aug 2018 08:00404
17 Aug 2018 09:00408
17 Aug 2018 10:00407
17 Aug 2018 11:00399
17 Aug 2018 12:00418
17 Aug 2018 13:00411
17 Aug 2018 14:00400
17 Aug 2018 15:00428
17 Aug 2018 16:00408
17 Aug 2018 17:00433
17 Aug 2018 18:00409
17 Aug 2018 19:00408
17 Aug 2018 20:00416
17 Aug 2018 21:00412
17 Aug 2018 22:00406
17 Aug 2018 23:00410
18 Aug 2018 00:00399
18 Aug 2018 01:00394
18 Aug 2018 02:00386
18 Aug 2018 03:00389
18 Aug 2018 04:00385
18 Aug 2018 05:00378
18 Aug 2018 06:00379
18 Aug 2018 07:00376
18 Aug 2018 08:00376
18 Aug 2018 09:00368
18 Aug 2018 10:00373
18 Aug 2018 11:00374
18 Aug 2018 12:00385
18 Aug 2018 13:00378
18 Aug 2018 14:00377
18 Aug 2018 15:00382
18 Aug 2018 16:00379
18 Aug 2018 17:00372
18 Aug 2018 18:00497
18 Aug 2018 19:00389
18 Aug 2018 20:00375
18 Aug 2018 21:00394
18 Aug 2018 22:00378
18 Aug 2018 23:00376
19 Aug 2018 00:00376
19 Aug 2018 01:00379
19 Aug 2018 02:00419
19 Aug 2018 03:00385
19 Aug 2018 04:00376
19 Aug 2018 05:00379
19 Aug 2018 06:00383
19 Aug 2018 07:00381
19 Aug 2018 08:00376
19 Aug 2018 09:00375
19 Aug 2018 10:00377
19 Aug 2018 11:00373
19 Aug 2018 12:00369
19 Aug 2018 13:00371
19 Aug 2018 14:00374
19 Aug 2018 15:00386
19 Aug 2018 16:00383
19 Aug 2018 17:00383
19 Aug 2018 18:00376
19 Aug 2018 19:00385
19 Aug 2018 20:00382
19 Aug 2018 21:00376
19 Aug 2018 22:00379
19 Aug 2018 23:00375
20 Aug 2018 00:00391
20 Aug 2018 01:00376
20 Aug 2018 02:00383
20 Aug 2018 03:00379
20 Aug 2018 04:00380
20 Aug 2018 05:00381
20 Aug 2018 06:00378
20 Aug 2018 07:00390
20 Aug 2018 08:00384
20 Aug 2018 09:00421
20 Aug 2018 10:00373
20 Aug 2018 11:00380

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits201050
Misses5345

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.