God of War 2: framerate drops after memory error

I was playing God of War 2 (from God of War Collection), everything was great except for the sound occasionally crackling. I reached the battle with Zeus, the emulator crashed with an error (something about memory allocation, I didn't take a screenshot) and after restarting, it started running much slower. Now, in the location before the battle, the framerate jumps from 20 to 60, even though just a couple of hours ago it was a stable 60. After the crash, I updated to the latest version (0.0.29-15518), before that I was playing on the second to last version (0.0.29-15516). What could be the problem and how can it be solved?

Also, the log is throwing out errors, I didn't pay attention if they were there before:
E SYS: 'sys_memory_allocate_from_container' failed with 0x80010004 : CELL_ENOMEM [1]
E SYS: 'sys_memory_allocate_from_container' failed with 0x80010004 : CELL_ENOMEM [2]
E sys_fs: 'sys_fs_stat' failed with 0x80010006 : CELL_ENOENT, “/dev_bdvd/PS3_GAME/USRDIR/GOW2/exec/wad/_sound/dvd_streams/hd1001q.vp5” [1]
E sys_fs: 'sys_fs_stat' failed with 0x80010006 : CELL_ENOENT, “/dev_bdvd/PS3_GAME/USRDIR/GOW2/exec/wad/_sound/dvd_streams/a_spi40a.vp5” [1]
E sys_fs: 'sys_fs_stat' failed with 0x80010006 : CELL_ENOENT, “/dev_bdvd/PS3_GAME/USRDIR/GOW2/exec/wad/_sound/dvd_streams/sp4004s.vp5” [1]
E RSX: Vertex program block aborts prematurely. Expect glitches.
as well as
E SYS: 'cellVdecDecodeAu' failed with 0x80610103 : CELL_VDEC_ERROR_BUSY [1]
E SYS: 'cellVdecDecodeAu' failed with 0x80610103 : CELL_VDEC_ERROR_BUSY [2]
E SYS: 'cellVdecDecodeAu' failed with 0x80610103 : CELL_VDEC_ERROR_BUSY [3]