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