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 00:0015958
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
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

Response time

Mean global response time, ms, from Pingdom:

DateResponse time (ms)
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 03:00243
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 19:00274

Caching

Hit ratio, last 7 days, from Fastly:

Cache resultRequests
Hits193083
Misses6673

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.