HTC One M8 został zoptymalizowany tak, by podbijał wydajność po wykryciu niektórych programów/narzędzi. Odpowiednią opcję „High performance mode” można też uruchomić ręcznie w opcjach programistycznych.
Nie jest jednak zalecane pozostawianie tej opcji aktywnej w czasie codziennego użytkowania – poziom naładowania baterii spadał będzie znacznie szybciej.
Sprawność przeglądarki WWW
SunSpider JavaScript Benchmark
Domyślna przeglądarka systemowa, [ms] mniej = lepiej
| Samsung Galaxy S5 (SM-G900F) |  377 |
| Apple iPhone 5S | 407 |
| Samsung Galaxy Note 3 | 583 |
| HTC One M8 |  635 |
| LG Nexus 5 | 728 |
| Sony Xperia Z1 | 733 |
| Sony Xperia Z Ultra | 734 |
| HTC One Max | 833 |
| Samsung Galaxy S 4 GT-i9505 | 841 |
| HTC Windows Phone 8X | 892 |
| ASUS Fonepad Note FHD 6 | 895 |
| Nokia Lumia 925 | 900 |
| LG G Flex | 915 |
| Nokia Lumia 820 | 918 |
| Nokia Lumia 920 | 923 |
| Apple iPhone 5 | 932 |
| Samsung Galaxy S4 zoom SM-C101 | 996 |
| Samsung Galaxy S3 | 1002 |
| Samsung Galaxy Note II | 1030 |
| HTC One | 1099 |
| Huawei Ascend W1 | 1120 |
| Nokia Lumia 625 | 1131 |
| GoClever Insignia 5X | 1146 |
| Samsung Galaxy S4 mini GT-I9195 | 1170 |
| GoClever Insignia 5 | 1186 |
| Acer Liquid S1 | 1203 |
| Sony Xperia Z | 1283 |
| LG Nexus 4 | 1370 |
| Nokia Lumia 520 | 1427 |
| Nokia Lumia 620 | 1432 |
| GoClever Quantum 4 | 1476 |
| Huawei Ascend P2 | 1627 |
| Huawei Ascend P1 | 1641 |
| BlackBerry Z10 | 1676 |
| BlackBerry Q5 | 1680 |
| HTC One X | 1684 |
| Asus Padfone | 1702 |
| Samsung Galaxy Note | 1776 |
| Samsung Galaxy S3 mini | 1891 |
| Sony Xperia M | 1903 |
| Motorola RAZR Maxx | 1940 |
| Motorola RAZR | 1979 |
| Samsung Galaxy Nexus | 1989 |
| Huawei Ascend G510 | 2053 |
| Yarvik Ingenia Synchro | 2127 |
| Apple iPhone 4S | 2251 |
| Huawei Honor U8860 | 2262 |
| GSmart GS202+ | 2334 |
| Nokia X (RM-980) | 2372 |
| Yarvik Ingenia X1 | 2393 |
| LG Swift L9 | 2514 |
| HTC Sensation XE | 2689 |
| HTC Sensation XL | 2726 |
| HTC One V | 3247 |
| HTC Rhyme | 3341 |
| Samsung Galaxy S 2 | 3447 |
| LG Swift L7 | 3818 |
| LG Swift 2X | 3826 |
| LG Prada 3 | 3894 |
| Motorola Atrix | 3920 |
| Samsung Galaxy R | 4100 |
| LG Swift 3D | 4278 |
| LG Swift L5 | 4535 |
| Sony Ericsson Xperia Neo | 5055 |
| HTC Desire S | 5762 |
| HTC EVO 3D | 6108 |
| HTC Titan | 6488 |
| Nokia Lumia 710 | 6768 |
| Nokia Lumia 800 | 6826 |
| Nokia 500 | 6832 |
| Samsung Omnia W | 6972 |
| HTC Radar | 9115 |
Z JavaScriptem HTC One M8 poradził sobie bardzo dobrze, choć jego wynik był zauważalnie gorszy od Samsunga Galaxy S5 i iPhone'a 5S.
3DMark (Ice Storm Unlimited)
3DMark (Ice Storm Unlimited) - TOTAL
| HTC One M8 (Android 4.4) | 20512 |
| Samsung Galaxy S5 (Android 4.4) | 18782 |
| LG G Flex (Android 4.2) | 18004 |
| LG Nexus 5 (Android 4.4) | 17952 |
| Sony Xperia Z1(Android 4.2) | 17183 |
| Sony Xperia Z Ultra (Android 4.2) | 16827 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 16171 |
| Apple iPhone 5S (iOS 7.0) | 14762 |
| HTC One Max (Android 4.3) | 10999 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 7186 |
| GoClever Insignia 5(Android 4.2) | 3162 |
| Acer Liquid S1(Android 4.2) | 3125 |
| GoClever Insignia 5X(Android 4.2) | 2900 |
| Huawei Ascend G510 (Android 4.1) | 2253 |
| Nokia X (RM-980) (Android 4.1) | 2240 |
3DMark (Ice Storm Unlimited) - Graphics
| HTC One M8 (Android 4.4) | 21497 |
| Samsung Galaxy S5 (Android 4.4) | 19957 |
| LG G Flex (Android 4.2) | 19163 |
| Apple iPhone 5S (iOS 7.0) | 18902 |
| LG Nexus 5 (Android 4.4) | 17925 |
| Sony Xperia Z Ultra (Android 4.2) | 17837 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 17802 |
| Sony Xperia Z1(Android 4.2) | 17795 |
| HTC One Max (Android 4.3) | 10530 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 6565 |
| GoClever Insignia 5(Android 4.2) | 2650 |
| Acer Liquid S1(Android 4.2) | 2614 |
| GoClever Insignia 5X(Android 4.2) | 2463 |
| Nokia X (RM-980) (Android 4.1) | 2091 |
| Huawei Ascend G510 (Android 4.1) | 2055 |
3DMark (Ice Storm Unlimited) - Physics
| LG Nexus 5 (Android 4.4) | 18048 |
| HTC One M8 (Android 4.4) | 17678 |
| Samsung Galaxy S5 (Android 4.4) | 15574 |
| Sony Xperia Z1(Android 4.2) | 15338 |
| LG G Flex (Android 4.2) | 14860 |
| Sony Xperia Z Ultra (Android 4.2) | 14044 |
| HTC One Max (Android 4.3) | 13033 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 12245 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 10743 |
| Acer Liquid S1(Android 4.2) | 9914 |
| GoClever Insignia 5(Android 4.2) | 9760 |
| Apple iPhone 5S (iOS 7.0) | 8357 |
| GoClever Insignia 5X(Android 4.2) | 7652 |
| Huawei Ascend G510 (Android 4.1) | 3398 |
| Nokia X (RM-980) (Android 4.1) | 2987 |
3DMark (Ice Storm Unlimited) - Graphics test 1 (fps)
| HTC One M8 (Android 4.4) | 113 |
| Apple iPhone 5S (iOS 7.0) | 108 |
| Samsung Galaxy S5 (Android 4.4) | 106 |
| LG G Flex (Android 4.2) | 104 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 103 |
| LG Nexus 5 (Android 4.4) | 93 |
| Sony Xperia Z Ultra (Android 4.2) | 91 |
| Sony Xperia Z1(Android 4.2) | 91 |
| HTC One Max (Android 4.3) | 54 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 38 |
| Acer Liquid S1(Android 4.2) | 16 |
| GoClever Insignia 5(Android 4.2) | 16 |
| GoClever Insignia 5X(Android 4.2) | 15 |
| Nokia X (RM-980) (Android 4.1) | 10 |
| Huawei Ascend G510 (Android 4.1) | 10 |
3DMark (Ice Storm Unlimited) - Graphics test 2 (fps)
| HTC One M8 (Android 4.4) | 80 |
| Samsung Galaxy S5 (Android 4.4) | 74 |
| LG G Flex (Android 4.2) | 70 |
| Sony Xperia Z1(Android 4.2) | 68 |
| Sony Xperia Z Ultra (Android 4.2) | 67 |
| LG Nexus 5 (Android 4.4) | 67 |
| Apple iPhone 5S (iOS 7.0) | 66 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 62 |
| HTC One Max (Android 4.3) | 40 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 23 |
| GoClever Insignia 5(Android 4.2) | 9 |
| Acer Liquid S1(Android 4.2) | 9 |
| GoClever Insignia 5X(Android 4.2) | 8 |
| Nokia X (RM-980) (Android 4.1) | 8 |
| Huawei Ascend G510 (Android 4.1) | 8 |
3DMark (Ice Storm Unlimited) - Physics test (fps)
| LG Nexus 5 (Android 4.4) | 57 |
| HTC One M8 (Android 4.4) | 56 |
| Samsung Galaxy S5 (Android 4.4) | 49 |
| Sony Xperia Z1(Android 4.2) | 49 |
| LG G Flex (Android 4.2) | 47 |
| Sony Xperia Z Ultra (Android 4.2) | 45 |
| HTC One Max (Android 4.3) | 41 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 39 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 34 |
| Acer Liquid S1(Android 4.2) | 32 |
| GoClever Insignia 5(Android 4.2) | 31 |
| Apple iPhone 5S (iOS 7.0) | 27 |
| GoClever Insignia 5X(Android 4.2) | 24 |
| Huawei Ascend G510 (Android 4.1) | 11 |
| Nokia X (RM-980) (Android 4.1) | 10 |
Zgodnie z oczekiwaniami – tryb „high performance” został włączony automatycznie podbijając wydajność na tyle, że HTC One M8 pokonał Samsunga Galaxy S5 nawet pomimo tego, że ten drugi ma (w teorii) nieco szybszy procesor.
AnTuTu 4
AnTuTu 4 - TOTAL SCORE
| HTC One M8 (Android 4.4) | 36352 |
| LG G Flex (Android 4.2) | 35791 |
| Samsung Galaxy S5 (Android 4.4) | 35431 |
| Sony Xperia Z1(Android 4.2) | 32846 |
| Sony Xperia Z Ultra (Android 4.2) | 32632 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 29574 |
| LG Nexus 5 (Android 4.4) | 26687 |
| HTC One Max (Android 4.3) | 26469 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 20761 |
| Acer Liquid S1(Android 4.2) | 16281 |
| GoClever Insignia 5(Android 4.2) | 15876 |
| Samsung Galaxy S4 zoom (Android 4.2) | 14899 |
| GoClever Insignia 5X(Android 4.2) | 14549 |
| GoClever Quantum 4(Android 4.2) | 11170 |
| Huawei Ascend G510 (Android 4.1) | 8307 |
| Nokia X (RM-980) (Android 4.1) | 7424 |
AnTuTu 4 - Multitasking
| Samsung Galaxy S5 (Android 4.4) | 7398 |
| HTC One M8 (Android 4.4) | 7006 |
| LG G Flex (Android 4.2) | 6928 |
| Sony Xperia Z1(Android 4.2) | 5882 |
| Sony Xperia Z Ultra (Android 4.2) | 5862 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 5457 |
| HTC One Max (Android 4.3) | 5100 |
| LG Nexus 5 (Android 4.4) | 3778 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 3553 |
| GoClever Insignia 5X(Android 4.2) | 3320 |
| GoClever Insignia 5(Android 4.2) | 3312 |
| Acer Liquid S1(Android 4.2) | 3298 |
| Samsung Galaxy S4 zoom (Android 4.2) | 2573 |
| GoClever Quantum 4(Android 4.2) | 2074 |
| Huawei Ascend G510 (Android 4.1) | 1809 |
| Nokia X (RM-980) (Android 4.1) | 1583 |
AnTuTu 4 - CPU - Dalvik
| HTC One M8 (Android 4.4) | 3676 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 3656 |
| Samsung Galaxy S5 (Android 4.4) | 3654 |
| LG G Flex (Android 4.2) | 3626 |
| Sony Xperia Z1(Android 4.2) | 3588 |
| Sony Xperia Z Ultra (Android 4.2) | 3525 |
| HTC One Max (Android 4.3) | 2695 |
| LG Nexus 5 (Android 4.4) | 2260 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1543 |
| Samsung Galaxy S4 zoom (Android 4.2) | 1278 |
| Acer Liquid S1(Android 4.2) | 1059 |
| GoClever Insignia 5(Android 4.2) | 1059 |
| GoClever Insignia 5X(Android 4.2) | 1056 |
| GoClever Quantum 4(Android 4.2) | 898 |
| Huawei Ascend G510 (Android 4.1) | 815 |
| Nokia X (RM-980) (Android 4.1) | 640 |
AnTuTu 4 - CPU - liczby całkowite
| Samsung Galaxy S5 (Android 4.4) | 3541 |
| HTC One M8 (Android 4.4) | 3419 |
| LG Nexus 5 (Android 4.4) | 3409 |
| LG G Flex (Android 4.2) | 3372 |
| Sony Xperia Z1(Android 4.2) | 2916 |
| Sony Xperia Z Ultra (Android 4.2) | 2685 |
| HTC One Max (Android 4.3) | 2578 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 2412 |
| Acer Liquid S1(Android 4.2) | 2298 |
| GoClever Insignia 5X(Android 4.2) | 2298 |
| GoClever Insignia 5(Android 4.2) | 2291 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1695 |
| Samsung Galaxy S4 zoom (Android 4.2) | 1197 |
| GoClever Quantum 4(Android 4.2) | 988 |
| Huawei Ascend G510 (Android 4.1) | 789 |
| Nokia X (RM-980) (Android 4.1) | 666 |
AnTuTu 4 - CPU - liczby zmiennoprzecinkowe
| HTC One M8 (Android 4.4) | 4204 |
| LG G Flex (Android 4.2) | 3648 |
| Samsung Galaxy S5 (Android 4.4) | 3623 |
| Sony Xperia Z1(Android 4.2) | 3387 |
| Sony Xperia Z Ultra (Android 4.2) | 3201 |
| HTC One Max (Android 4.3) | 3004 |
| LG Nexus 5 (Android 4.4) | 2671 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 2221 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1880 |
| GoClever Insignia 5(Android 4.2) | 1586 |
| Acer Liquid S1(Android 4.2) | 1557 |
| GoClever Insignia 5X(Android 4.2) | 1433 |
| Samsung Galaxy S4 zoom (Android 4.2) | 823 |
| GoClever Quantum 4(Android 4.2) | 647 |
| Huawei Ascend G510 (Android 4.1) | 499 |
| Nokia X (RM-980) (Android 4.1) | 422 |
AnTuTu 4 - Dalvik
| HTC One M8 (Android 4.4) | 1681 |
| LG G Flex (Android 4.2) | 1592 |
| Samsung Galaxy S5 (Android 4.4) | 1572 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 1433 |
| LG Nexus 5 (Android 4.4) | 1423 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1410 |
| Acer Liquid S1(Android 4.2) | 1395 |
| GoClever Insignia 5(Android 4.2) | 1390 |
| Sony Xperia Z1(Android 4.2) | 1296 |
| Sony Xperia Z Ultra (Android 4.2) | 1285 |
| HTC One Max (Android 4.3) | 1282 |
| GoClever Insignia 5X(Android 4.2) | 1123 |
| Samsung Galaxy S4 zoom (Android 4.2) | 941 |
| GoClever Quantum 4(Android 4.2) | 595 |
| Huawei Ascend G510 (Android 4.1) | 461 |
| Nokia X (RM-980) (Android 4.1) | 403 |
AnTuTu 4 - RAM - szybkość
| HTC One M8 (Android 4.4) | 2736 |
| LG G Flex (Android 4.2) | 2645 |
| Sony Xperia Z1(Android 4.2) | 2432 |
| Sony Xperia Z Ultra (Android 4.2) | 2327 |
| Samsung Galaxy S5 (Android 4.4) | 2315 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 2133 |
| LG Nexus 5 (Android 4.4) | 1956 |
| HTC One Max (Android 4.3) | 1585 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 1347 |
| GoClever Quantum 4(Android 4.2) | 705 |
| Samsung Galaxy S4 zoom (Android 4.2) | 652 |
| Huawei Ascend G510 (Android 4.1) | 574 |
| GoClever Insignia 5(Android 4.2) | 550 |
| Acer Liquid S1(Android 4.2) | 548 |
| Nokia X (RM-980) (Android 4.1) | 547 |
| GoClever Insignia 5X(Android 4.2) | 534 |
AnTuTu 4 - Grafika 2D
| HTC One Max (Android 4.3) | 1659 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 1649 |
| HTC One M8 (Android 4.4) | 1642 |
| LG G Flex (Android 4.2) | 1641 |
| Sony Xperia Z1(Android 4.2) | 1639 |
| Sony Xperia Z Ultra (Android 4.2) | 1638 |
| Samsung Galaxy S5 (Android 4.4) | 1620 |
| LG Nexus 5 (Android 4.4) | 1608 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1587 |
| Samsung Galaxy S4 zoom (Android 4.2) | 1527 |
| Acer Liquid S1(Android 4.2) | 791 |
| GoClever Insignia 5(Android 4.2) | 746 |
| GoClever Insignia 5X(Android 4.2) | 701 |
| Nokia X (RM-980) (Android 4.1) | 610 |
| Huawei Ascend G510 (Android 4.1) | 591 |
| GoClever Quantum 4(Android 4.2) | 555 |
AnTuTu 4 - Grafika 3D
| Sony Xperia Z1(Android 4.2) | 9782 |
| LG G Flex (Android 4.2) | 9736 |
| Sony Xperia Z Ultra (Android 4.2) | 9624 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 9476 |
| HTC One M8 (Android 4.4) | 9464 |
| Samsung Galaxy S5 (Android 4.4) | 9301 |
| LG Nexus 5 (Android 4.4) | 7265 |
| HTC One Max (Android 4.3) | 6533 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 5042 |
| Samsung Galaxy S4 zoom (Android 4.2) | 4339 |
| GoClever Insignia 5(Android 4.2) | 4135 |
| Acer Liquid S1(Android 4.2) | 4031 |
| GoClever Quantum 4(Android 4.2) | 3408 |
| GoClever Insignia 5X(Android 4.2) | 3030 |
| Huawei Ascend G510 (Android 4.1) | 1498 |
| Nokia X (RM-980) (Android 4.1) | 1426 |
AnTuTu 4 - Pamięć - I/O
| LG G Flex (Android 4.2) | 1903 |
| HTC One M8 (Android 4.4) | 1839 |
| Sony Xperia Z Ultra (Android 4.2) | 1810 |
| Samsung Galaxy S5 (Android 4.4) | 1747 |
| LG Nexus 5 (Android 4.4) | 1687 |
| HTC One Max (Android 4.3) | 1393 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 1298 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 1288 |
| Sony Xperia Z1(Android 4.2) | 1234 |
| Samsung Galaxy S4 zoom (Android 4.2) | 939 |
| GoClever Quantum 4(Android 4.2) | 730 |
| Acer Liquid S1(Android 4.2) | 679 |
| Huawei Ascend G510 (Android 4.1) | 666 |
| Nokia X (RM-980) (Android 4.1) | 597 |
| GoClever Insignia 5X(Android 4.2) | 424 |
| GoClever Insignia 5(Android 4.2) | 402 |
AnTuTu 4 - Baza danych - I/O
| LG G Flex (Android 4.2) | 700 |
| Sony Xperia Z1(Android 4.2) | 690 |
| HTC One M8 (Android 4.4) | 685 |
| Sony Xperia Z Ultra (Android 4.2) | 675 |
| Samsung Galaxy S5 (Android 4.4) | 660 |
| HTC One Max (Android 4.3) | 640 |
| Samsung Galaxy S4 zoom (Android 4.2) | 630 |
| LG Nexus 5 (Android 4.4) | 630 |
| GoClever Insignia 5X(Android 4.2) | 630 |
| ASUS Fonepad Note FHD 6 (Android 4.2) | 630 |
| Acer Liquid S1(Android 4.2) | 625 |
| Samsung Galaxy Note 3 SM-N9005 (Android 4.3) | 625 |
| Huawei Ascend G510 (Android 4.1) | 605 |
| GoClever Quantum 4(Android 4.2) | 570 |
| Nokia X (RM-980) (Android 4.1) | 530 |
| GoClever Insignia 5(Android 4.2) | 405 |
Ponownie lepiej niż Galaxy S5. Podbicie wydajności w benchmarkach działa. Różnica w stosunku do Galaxy S5 nie jest jednak duża.
GFXBench – test T-Rex
W teście T-Rex i Manhattan programu GFXBench 3 wyniki były zbliżone (nieco lepsze) do SGS5.
Czas pracy na baterii
- Czas rozmów (3G): 19 godzin 27 minut
- Przeglądanie internetu: 8 godzin 42 minut
- Odtwarzanie filmu: 9 godzin
Bateria wbudowana w HTC One M8 w naszym przypadku pozwalała na ciągłe odtwarzanie filmów z napisami zewnętrznymi przez niemal równe 9 godzin. Wynik ten został osiągnięty przy jasności ustawionej na ok. 40%, głośności na połowę oraz przy włączonym trybie oszczędzania baterii. Użytym odtwarzaczem był MX Player. W czasie codziennego użytkowania oczekiwać mogliśmy pracy przez około 2,5 dnia (umiarkowana intensywność).
