Tom Clancy's Rainbow Six Siege AMD Athlon X4 880K RX 460

i did benchmark this game three times, and the first and second was horrible, it was below 40fps everytime there's an explode, but the third one was smooth like around 50 - 70 fps without fps drop when there's an explode. Idk if it was the game or my hardware. Enjoy... Specs : AMD Athlon X4 880K 4.2Ghz ASRock A88M-G/3.1 FM2+ PowerColor RX460 2GB GDDR5 RAM V-GEN 2X4 8GB DDR3 PSU GAMEMAX GP-550 550Watt 80+ Bronze SSD SanDisk 120GB HDD Toshiba 1TB Recorded with Radeon ReLive