diff --git a/kernel/trunk/const.inc b/kernel/trunk/const.inc
index f54aa9e44c..29b5d7dc9f 100644
--- a/kernel/trunk/const.inc
+++ b/kernel/trunk/const.inc
@@ -189,6 +189,7 @@ TASK_BASE           equ (OS_BASE+0x0003010)
 TASK_DATA           equ (OS_BASE+0x0003020)
 TASK_EVENT          equ (OS_BASE+0x0003020)
 
+d_width_calc_area   equ (OS_BASE+0x0005000)
 mouseunder          equ (OS_BASE+0x0006900)
 CDDataBuf           equ (OS_BASE+0x0007000)
 FLOPPY_BUFF         equ (OS_BASE+0x0008000)
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index d842df51a6..412b3ebcf2 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -402,6 +402,8 @@ high_code:
         mul     [_display.height]
         mov     [_WinMapSize], eax
 
+        call    calculate_fast_getting_offset_for_WinMapAddress
+
         mov     esi, BOOT_VAR+0x9080
         movzx   ecx, byte [esi-1]
         mov     [NumBiosDisks], ecx
@@ -4793,7 +4795,22 @@ read_from_hd:                           ; Read from hd - fn not in use
 
 paleholder:
         ret
-
+;------------------------------------------------------------------------------
+align 4
+calculate_fast_getting_offset_for_WinMapAddress:
+; calculate data area for fast getting offset to _WinMapAddress
+        mov     eax, [_display.width]
+        mov     ecx, [_display.height]
+        inc     ecx
+        mov     edi, d_width_calc_area
+        cld
+@@:
+        stosd
+        add     eax, [_display.width]
+        dec     ecx
+        jnz     @r
+        ret
+;------------------------------------------------------------------------------
 align 4
 set_screen:
         cmp     eax, [Screen_Max_X]
@@ -4830,6 +4847,8 @@ set_screen:
         test    eax, eax
         jz      .epic_fail
 
+        call    calculate_fast_getting_offset_for_WinMapAddress
+
         popad
 
         call    repos_windows
diff --git a/kernel/trunk/memmap.inc b/kernel/trunk/memmap.inc
index 84fd8b1d6e..a0308ebf83 100644
--- a/kernel/trunk/memmap.inc
+++ b/kernel/trunk/memmap.inc
@@ -62,7 +62,7 @@
 ;         3c   dword  cpu usage in cpu timer tics
 ;
 ;
-;   5000  ->   68FF   free (6k6)
+;   5000  ->   68FF   display width fast calc area (6k6)
 ;   6900  ->   6EFF   saved picture under mouse pointer (1k5)
 ;
 ;   6F00  ->   6FFF   free (256)
diff --git a/kernel/trunk/video/vesa20.inc b/kernel/trunk/video/vesa20.inc
index 4ef34a4b39..78d8718606 100644
--- a/kernel/trunk/video/vesa20.inc
+++ b/kernel/trunk/video/vesa20.inc
@@ -556,14 +556,10 @@ __sys_putpixel:
         jnz     .forced
 
 ; not forced:
-
-        push    eax
-        mov     edx, [_display.width]; screen x size
-        imul    edx, ebx
-        add     eax, [_WinMapAddress]
+        mov     edx, [d_width_calc_area + ebx*4]
+        add     edx, [_WinMapAddress]
         movzx   edx, byte [eax+edx]
         cmp     edx, [CURRENT_TASK]
-        pop     eax
         jne     .exit
 ;--------------------------------------
 align 4