2.4.5_1 much higher RAM usage than 2.4.4_p3 with no packages

nzkiwi68

Same config.
Alix APU2 with 2 GB of RAM

2.4.4_p3
Using 20% of 1870 MiB RAM

2.4.5_1
Using 70% of 1870 MiB RAM

Tested across many firewalls, same result, post upgrade, much higher RAM usage
No packages installed
Running ZFS file system
Tried rebooting, same high RAM usage

See the screen shots below;

nzkiwi68

It looks like a larger amount of RAM is taken up for paging, couild this be ZFS file system?

SYSTEM MEMORY INFORMATION:
mem_wire:        1198047232 (   1142MB) [ 63%] Wired: disabled for paging out
mem_active:  +     76308480 (     72MB) [  4%] Active: recently referenced
mem_inactive:+    127647744 (    121MB) [  6%] Inactive: recently not referenced
mem_cache:   +            0 (      0MB) [  0%] Cached: almost avail. for allocation
mem_free:    +    497741824 (    474MB) [ 26%] Free: fully available for allocation
mem_gap_vm:  +      -258048 (      0MB) [  0%] Memory gap: UNKNOWN
-------------- ------------ ----------- ------
mem_all:     =   1899487232 (   1811MB) [100%] Total real memory managed
mem_gap_sys: +     50384896 (     48MB)        Memory gap: Kernel?!
-------------- ------------ -----------
mem_phys:    =   1949872128 (   1859MB)        Total real memory available
mem_gap_hw:  +    197611520 (    188MB)        Memory gap: Segment Mappings?!
-------------- ------------ -----------
mem_hw:      =   2147483648 (   2048MB)        Total real memory installed

SYSTEM MEMORY SUMMARY:
mem_used:        1522094080 (   1451MB) [ 70%] Logically used memory
mem_avail:   +    625389568 (    596MB) [ 29%] Logically available memory
-------------- ------------ ----------- ------
mem_total:   =   2147483648 (   2048MB) [100%] Logically total memory