linux - strace high epoll_wait time -

i facing high epoll_wait time when used command check page execution.

    strace -o output.txt -f -r -s4096 -p 21605 

the outout big txt file interested in piece of data , unable find out reason of this. data dynamic php page , not heavy dont expect long response time

21605      0.000043 semop(38830083, {{0, -1, sem_undo}}, 1) = 0 21605      0.611909 epoll_wait(30, {{epollin, {u32=25218632, u64=25218632}}}, 4, 10000) = 1 21605      0.103429 accept4(3, {sa_family=af_inet, sin_port=htons(56826), sin_addr=inet_addr("ip address")}, [16], sock_cloexec) = 33 21605      0.000059 semop(38830083, {{0, 1, sem_undo}}, 1) = 0 

i unhappy 0.611909 time in epoll , 0.103429 accept4 . improve these performance great

speed other end. time spent waiting accept connection or receive data other side.