我测试了150个todos到我的表中的插入。我在工作区中用循环做了一次，然后用引用做了一次。我以为使用引用会更快，但不知何故，它是167.333的引用和类似143.431的东西（我假设它的毫秒？）使用引用。我是ABAP的新手，我做错了什么或者为什么？我的代码：

TYPES: BEGIN OF ty_todo,
         mandt     TYPE mandt,
         id        TYPE int4,
         userId    TYPE int4,
         todo      TYPE string,
         completed TYPE abap_bool,
       END OF ty_todo.

DATA lv_dauer TYPE i.
DATA: lt_todo TYPE STANDARD TABLE OF ty_todo WITH DEFAULT KEY.
DATA wa_todo TYPE ty_todo.
DATA: lv_json TYPE string.
FIELD-SYMBOLS: <fs_todo> type ty_todo.

lv_json = `[{"id":1,"todo":"Do something nice for someone I care about","completed":true,"userId":26},...] 

* JSON -> ABAP (iTab)
/ui2/cl_json=>deserialize(
  EXPORTING
    json             = lv_json
*    jsonx            =
    pretty_name      = /ui2/cl_json=>pretty_mode-camel_case
*    assoc_arrays     =
*    assoc_arrays_opt =
*    name_mappings    =
*    conversion_exits =
*    hex_as_base64    =
  CHANGING
    data             = lt_todo
).

DELETE FROM zalm_fs_todos.

get run time field lv_dauer.

*Loop in Workarea
LOOP AT lt_todo into DATA(lv_todo).
  INSERT zalm_fs_todos from lv_todo. 
ENDLOOP.

*Loop mit Field-Symbol
* loop at lt_todo assigning <fs_todo>.  
*      INSERT zalm_fs_todos from <fs_todo>.
*endloop.

get run time field lv_dauer.
Write lv_dauer.