Slow loading after clicking complete order

[rahulkg]

After clicking whmcs complete order button, it takes more than 1 minute to show invoice, We have tested by disabling all hooks and third party addons . but still the loading time not reduced. Why it happens?

[rahulkg]

We have tried to order a new product and run the following command after advice from whmcs support. and output and command is given as follows.

strace -t -f -o strace.txt /usr/bin/php ordersadd.php

and got the following logs

" access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
23013 11:24:35 open("/usr/lib/x86_64-linux-gnu/libargon2.so.1", O_RDONLY|O_CLOEXEC) = 3
23013 11:24:35 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240\16\0\0\0\0\0\0"..., 832) = 832
23013 11:24:35 fstat(3, {st_mode=S_IFREG|0644, st_size=34792, ...}) = 0
23013 11:24:35 mmap(NULL, 2130128, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fed3a9b1000
23013 11:24:35 mprotect(0x7fed3a9b9000, 2093056, PROT_NONE) = 0
23013 11:24:35 mmap(0x7fed3abb8000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7fed3abb8000
23013 11:24:35 close(3) = 0
23013 11:24:35 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
23013 11:24:35 open("/lib/x86_64-linux-gnu/libresolv.so.2", O_RDONLY|O_CLOEXEC) = 3
23013 11:24:35 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220:\0\0\0\0\0\0"..., 832) = 832
23013 11:24:35 fstat(3, {st_mode=S_IFREG|0644, st_size=84856, ...}) = 0
23013 11:24:35 mmap(NULL, 2189928, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fed3a79a000
23013 11:24:35 mprotect(0x7fed3a7ae000, 2093056, PROT_NONE) = 0
23013 11:24:35 mmap(0x7fed3a9ad000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13000) = 0x7fed3a9ad000
23013 11:24:35 mmap(0x7fed3a9af000, 6760, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fed3a9af000
23013 11:24:35 close(3) = 0
23013 11:24:35 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
23013 11:24:35 open("/lib/x86_64-linux-gnu/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
23013 11:24:35 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \"\0\0\0\0\0\0"..., 832) = 832
23013 11:24:35 fstat(3, {st_mode=S_IFREG|0644, st_size=109144, ...}) = 0
23013 11:24:35 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fed3adca000
23013 11:24:35 mmap(NULL, 2204200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fed3a57f000
23013 11:24:35 mprotect(0x7fed3a599000, 2093056, PROT_NONE) = 0
23013 11:24:35 mmap(0x7fed3a798000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19000) = 0x7fed3a798000
23013 11:24:35 close(3) = 0
23013 11:24:35 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
23013 11:24:35 open("/lib/x86_64-linux-gnu/libpcre.so.3", O_RDONLY|O_CLOEXEC) = 3
23013 11:24:35 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\27\0\0\0\0\0\0"..., 832) = 832
23013 11:24:35 fstat(3, {st_mode=S_IFREG|0644, st_size=448440, ...}) = 0
23013 11:24:35 mmap(NULL, 2543976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fed3a311000
23013 11:24:35 mprotect(0x7fed3a37d000, 2097152, PROT_NONE) = 0
23013 11:24:35 mmap(0x7fed3a57d000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6c000) = 0x7fed3a57d000
23013 11:24:35 close(3) = 0
23013 11:24:35 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
23013 11:24:35 open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
23013 11:24:35 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200U\0\0\0\0\0\0"..., 832) = 832
23013 11:24:35 fstat(3, {st_mode=S_IFREG|0644, st_size=1051056, ...}) = 0
23013 11:24:35 mmap(NULL, 3146072, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fed3a010000
23013 11:24:35 mprotect(0x7fed3a110000, 2093056, PROT_NONE) = 0"

But dont get from above logs where the delay has occured . Can you advise further ?